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 xserver-1.13 #134547

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passed xserver-1.14 #134548

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passed xserver-1.15 #134549

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passed xserver-1.16 #134550

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passed xserver-1.17 #134551

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passed xserver-1.18 #134552

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passed xserver-1.18-clang #134553

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passed xserver-1.19 #134554

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passed xserver-1.19-clang #134555

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passed xserver-1.20 #134545

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passed xserver-1.20-clang #134546

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