compositor: fix transformed opaque surface repainting
compositor: fix transformed opaque surface repainting

Computing the real maximal opaque screen aligned rectangle of a
transformed surface is hard. Let's drop the opaque optimisation
instead.

Signed-off-by: Pekka Paalanen <6c0263d81461c956d504307112a4ce25eaacc3d1@gmail.com>

sir-murray/weston,udoprog/weston,krezovic/weston,Gnurou/weston,eyolfson/weston,xorgy/weston,mchalupa/weston,kwm81/weston,eyolfson/weston,Fantu/compositor-spice,jonnylamb/weston,Gnurou/weston,xorgy/weston,krezovic/weston,giucam/weston,Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,mchalupa/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston,Fantu/compositor-spice,jonnylamb/weston,giucam/weston,kwm81/weston,sir-murray/weston