Always allow touchpad if no other pointer device.

It was possible to completely disable
touchpad even when there was no other
pointer device. And worse, this panel
being no keyboard-browsable, the only
practical solution was then to find a
mouse and connect it to the computer.

Closes #429.
11 jobs for arnaudb/429-master-Disable-touchpad-only-if-mouse in 3 minutes and 28 seconds (queued for 2 seconds)
latest
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  Build
passed build #255272

00:01:22

 
  Test
passed asan #255274

00:02:05

passed test #255273

00:01:52

 
  Manual
manual armv8 #255279
allowed to fail manual
manual flatpak #255275
allowed to fail manual
manual msan #255278
allowed to fail manual
manual ppc64le #255280
allowed to fail manual
manual tsan #255276
allowed to fail manual
manual ubsan #255277
allowed to fail manual
 
  Review
manual review #255281
allowed to fail manual
manual stop_review #255282
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