xwayland/present: Move xwl_present_reset_timer call out of xwl_present_flip

xwl_present_reset_timer checks if the pending flip is synchronous, so
we need to call it after adding the pending flip to the flip queue.

Closes: xorg/xserver#1219
Fixes: b2a06e07 "xwayland/present: Drop sync_flip member of struct xwl_present_window"
Tested-by: Olivier Fourdan <ofourdan@redhat.com>
Acked-by: Olivier Fourdan <ofourdan@redhat.com>
5 jobs for xwl_present_flip-xwl_present_reset_timer in 6 minutes and 30 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Docker Image
passed debian-buster #13809741

00:00:21

 
  Build And Test
passed autotools #13809742

00:06:08

passed meson #13809743

00:03:01

passed meson-noglamor #13809744

00:02:14

passed mingw-cross-build #13809745

00:00:51