internal: few small monitor improvements (#8890)

* remove framesToSkip, its not used anymore

* only set drm format when needed after leaving direct scanout

* always set drm damage

src/helpers/Monitor.hpp

@@ -90,9 +90,7 @@ class CMonitor {
 
     SP<Aquamarine::IOutput>     output;
     float                       refreshRate     = 60;
-    int                         framesToSkip    = 0;
     int                         forceFullFrames = 0;
-    bool                        noFrameSchedule = false;
     bool                        scheduledRecalc = false;
     wl_output_transform         transform       = WL_OUTPUT_TRANSFORM_NORMAL;
     float                       xwaylandScale   = 1.f;