touchpad: correct a comment regarding the touchpad integration

The previous text wasn't accurate enough, USB used to be considered
external but we've since started deferring to the hwdb for those (except
Apple).

Fixes #483

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
48 jobs for master in 17 minutes and 9 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Prep
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alpine:latest@container-prep

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arch:rolling@container-prep

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check-ci-script

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fedora:30@container-prep

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fedora:31@container-prep

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fedora:32@container-prep

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kvm
fedora:32@qemu-prep

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freebsd:11.2@container-prep

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ubuntu:19.10@container-prep

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  Build
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build-no-debuggui@fedora:32

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build-no-debuggui-nodeps@fedora:32

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build-no-docs@fedora:32

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build-no-docs-nodeps@fedora:32

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build-no-libwacom@fedora:32

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build-no-libwacom-nodeps@fedora:32

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build-no-tests@fedora:32

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build-no-tests-nodeps@fedora:32

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flake8@fedora:32

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scan-build@fedora:32

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usr-bin-env-python@fedora:32

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valgrind@fedora:32

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  Vm
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kvm
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kvm
vm-gestures-device-no-libwacom

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kvm
vm-others

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kvm
vm-others-no-libwacom

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kvm
vm-pointer

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kvm
vm-pointer-no-libwacom

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kvm
vm-tablet

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kvm
vm-tablet-no-libwacom

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kvm
vm-tap

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kvm
vm-tap-no-libwacom

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kvm
vm-touchpad

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kvm
vm-touchpad-no-libwacom

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  Valgrind
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kvm
vm-valgrind-gestures-device

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kvm
vm-valgrind-others

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kvm
vm-valgrind-pointer

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kvm
vm-valgrind-tablet

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kvm
vm-valgrind-tap

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kvm
vm-valgrind-touchpad

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  Distro
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alpine:latest@default-build

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arch:rolling@default-build

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default-build-release@fedora:32

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fedora:30@default-build

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fedora:31@default-build

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fedora:32@default-build

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freebsd:11.2@default-build

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passed #2659903
ubuntu:19.10@default-build

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  Deploy
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wayland-web

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