Call amdgpu_present_set_screen_vrr from amdgpu_vrr_property_update

If the window is currently flipping.

This might make a difference when the property gets disabled: Variable
refresh will now be disabled immediately in that case, instead of only
when the window can no longer use page flipping at all.
12 jobs for <span class="ref-name">vrr-improvements</span> in 11 minutes and 32 seconds (queued for 28 seconds)
Status Job ID Name Coverage
  Docker Image
passed #111235
debian-testing

00:01:06

 
  Build
passed #111238
xserver-1.13

00:00:36

passed #111239
xserver-1.14

00:01:19

passed #111240
xserver-1.15

00:01:20

passed #111241
xserver-1.16

00:00:56

passed #111242
xserver-1.17

00:01:03

passed #111243
xserver-1.18

00:00:46

passed #111244
xserver-1.18-clang

00:00:39

passed #111245
xserver-1.19

00:00:38

passed #111246
xserver-1.19-clang

00:00:38

passed #111236
xserver-1.20

00:01:40

passed #111237
xserver-1.20-clang

00:00:46