Sync screens draw order on set Priority. (#4380)
Sync screens draw order on set Priority. (#4380)

* Sync screens draw order on set Priority.

* Add same-value check.

* Make priority attribute public.

* Minor comment fix.

* Remove redundant jsdoc flag.

* Tweak priority description

Co-authored-by: Will Eastcott <37d41699bdee4fcb969ca499eb0f8b82c60d59cc@playcanvas.com>
MicroWorldwide/PlayCanvas,MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine