cairo-util: Use nearest filtering for rendering frame
cairo-util: Use nearest filtering for rendering frame

We don't need bilinear filtering here, the corners aren't scaled and
the scaled edges are just stretched along one axis.

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