main: Use the seat pointer device for touchpad gesture events

In cab1dcb6, events stopped carrying around
a separate source device, and instead the seat pointer is always used as
the device for scroll events. However, this is also relevant for touchpad
gesture events and they are ignored otherwise.
14 jobs for wip/exalm/touchpad-events in 75 minutes and 35 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  .Pre
passed #1172820
style-check-diff

00:02:51

 
  Build
failed #1175544
fedora-x86_64

01:00:03

passed #1172823
installed-tests

00:06:54

passed #1172825
macos
macos

00:11:51

passed #1172824
win32-ps
msys2-mingw64

00:06:30

passed #1172822
release-build

00:14:41

failed #1172821
fedora-x86_64

00:06:07

canceled #1174058
fedora-x86_64

00:55:35

 
  Analysis
failed #1172827
asan allowed to fail
asan-build

00:07:01

passed #1172826
static-scan

00:09:22

 
  Docs
passed #1172828
reference

00:15:31

 
  Flatpak
manual #1172829
flatpak allowed to fail manual
flatpak-manual:demo
manual #1172831
flatpak allowed to fail manual
flatpak-manual:icon-browser
manual #1172830
flatpak allowed to fail manual
flatpak-manual:widget-factory
 
Name Stage Failure
failed
asan-build Analysis
 - css: 214 total, 212 pass, 2 fail
Processing gtk suite a11y:
- a11y: 22 total, 20 pass, 2 fail
Processing gtk suite tools:
- tools: 4 total, 3 pass, 1 fail
Processing gtk suite reftest:
- reftest: 134 total, 129 pass, 5 fail
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
fedora-x86_64 Build The script exceeded the maximum execution time set for the job
499/604 gtk:reftest / reftest box-order.ui                                                                   TIMEOUT        90.01s
500/604 gtk:reftest / reftest box-pseudo-classes.ui TIMEOUT 90.01s
501/604 gtk:reftest / reftest box-shadow-changes-modify-clip.ui TIMEOUT 90.01s
502/604 gtk:reftest / reftest box-shadow-spec-inset.ui TIMEOUT 90.01s
503/604 gtk:reftest / reftest box-shadow-spread.ui TIMEOUT 90.01s
504/604 gtk:reftest / reftest box-shadow-with-blend-mode.ui TIMEOUT 90.01s
505/604 gtk:reftest / reftest button-wrapping.ui TIMEOUT 90.01s
506/604 gtk:reftest / reftest centerlayout-invisible-child.ui TIMEOUT 90.01s
ERROR: Failed to cleanup volumes
ERROR: Job failed: execution took longer than 1h0m0s seconds