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.

Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
11 jobs for vrr-improvements in 2 minutes and 16 seconds (queued for 19 seconds)
Status Job ID Name Coverage
  Build
passed #134547
xserver-1.13

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xserver-1.18-clang

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xserver-1.20

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passed #134546
xserver-1.20-clang

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