Revert "udev: copy the trackpoint sensitivity directly from sysfs"
The lenovo compact keyboard with trackpoint has a sensitivity of 5, which causes the trackpoint range to be 0. This in turn causes inf/NaN during pointer acceleration as we divide by 0 and makes the cursor go unpredictably somewhere it probably shouldn't be. This is part of a wider problem in that the current sensitivity handling doesn't work well for values well below the default of 128. Any such values are scaled up to multiples of pixels instead of just working as-is. Reverting the automatic sensitivity parsing, any systemd udev property set to change the sensitivity increases it, so we don't run into this bug. https://bugzilla.redhat.com/show_bug.cgi?id=1583324 This reverts commit a4036a33.
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