randr: Use RRTransformEqual in RRCrtcPendingTransform

Currently, RRCrtcPendingTransform returns false unless the
transformation matrix itself is changing. This makes RRCrtcSet skip
doing anything if the only thing that is changing is the transform
filter.

There's already a function for comparing RRTransformPtrs, so use that
instead.

Tested by running

  xrandr --output DP-1 --mode 1920x1080 --rate 144 --scale 0.5x0.5 --filter nearest

follwed by

  xrandr --output DP-1 --mode 1920x1080 --rate 144 --scale 0.5x0.5 --filter bilinear

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-and-Tested-by: Michel Dänzer <michel.daenzer@amd.com>
(cherry picked from commit 091af80b)