xwayland: Include 65534 into .X11-unix UID check

Toolbox containers have /tmp mounted as 65534. This change allows
running mutter under toolbox.
13 jobs for !1815 with fix-toolbox in 19 minutes and 48 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Review
passed #1243377
check-commit-log

00:01:36

passed #1243378
check-merge-request

00:00:52

 
  Prepare
passed #1243380
aarch64
build-fedora-container@aarch64

00:00:19

passed #1243379
build-fedora-container@x86_64

00:00:28

 
  Build
passed #1243382
aarch64
build-mutter@aarch64

00:03:13

passed #1243381
build-mutter@x86_64

00:04:21

passed #1243384
build-without-native-backend-and-wayland@x86_64

00:03:23

passed #1243383
build-without-opengl-and-glx@x86_64

00:02:20

 
  Test
passed #1243387
can-build-gnome-shell@x86_64

00:03:00

passed #1243386
aarch64
test-mutter@aarch64

00:07:51

passed #1243385
test-mutter@x86_64

00:03:33

 
  Coverage
passed #1243389
aarch64
test-mutter-coverage@aarch64

00:06:42

47.0%
passed #1243388
test-mutter-coverage@x86_64

00:04:24

47.0%