Reduce unnecessary wallpaper target searches

Because
- ActivityRecord#setVisibilityInner always calls
  requestUpdateWallpaperIfNeeded for visibility change.
- WallpaperController#mFindWallpaperTargetFunction doesn't
  check drawn state, the result of commitFinishDrawing
  won't affect wallpaper target.

Also optimize DisplayContent#mApplySurfaceChangesTransaction
a bit to reduce unnecessary method invocation.

Bug: 163976519
Flag: EXEMPT remove outdated code
Test: CtsWindowManagerDeviceActivity
Change-Id: Icee41a296ff41449b76e807634e6f7948d1cedd9