simple-touch: Exit on xdg_toplevel::close

This makes it possible to close this client without using a terminal,
especially useful on a phone.

Signed-off-by: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
15 jobs for main in 3 minutes and 2 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Base Container
passed aarch64-debian-container_prep #14786699
aarch64

00:00:25

passed armv7-debian-container_prep #14786698
aarch64

00:00:24

passed x86_64-debian-container_prep #14786697

00:00:23

 
  Full Build And Test
passed aarch64-clang-debian-full-build #14786703
kvm-aarch64

00:02:25

passed aarch64-debian-full-build #14786701
kvm-aarch64

00:02:06

passed x86_64-clang-debian-full-build #14786702
kvm

00:01:57

passed x86_64-debian-full-build #14786700
kvm

00:01:31

 
  No Gl Build And Test
passed aarch64-debian-no-gl-build #14786707
kvm-aarch64

00:00:35

passed armv7-clang-debian-no-gl-build #14786706
aarch64

00:00:25

passed armv7-debian-no-gl-build #14786705
aarch64

00:00:28

passed x86_64-debian-no-gl-build #14786704
kvm

00:00:43

 
  Other Builds
passed docs-build #14786708

00:01:00

 
  Pages
passed docs-and-coverage #14786709

00:00:52

passed pages #14786710

00:00:17

 
  Deploy
passed pages:deploy

00:00:00