xwayland: fix -noTouchPointerEmulation

Passing -noTouchPointerEmulation results in an error about the
flag not being recognized.

Signed-off-by: Simon Ser <contact@emersion.fr>
Fixes: 7d34b1f2 ("xwayland: add -noTouchPointerEmulation")
5 jobs for no-touc-pointer-emu-flag in 5 minutes and 11 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #15023323

00:00:25

 
  Build And Test
passed autotools #15023324

00:04:46

passed meson #15023325

00:02:13

passed meson-noglamor #15023326

00:01:31

passed mingw-cross-build #15023327

00:00:46