gl-renderer: Make texture_used a bool instead of an int
gl-renderer: Make texture_used a bool instead of an int

Signed-off-by: Derek Foreman <2f97e0f0bc172406aab8ccd42dab54c95bab8759@osg.samsung.com>
Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

giucam/weston,Fantu/compositor-spice,Gnurou/weston,kwm81/weston,sir-murray/weston,sir-murray/weston,Gnurou/weston,giucam/weston,krezovic/weston,Fantu/compositor-spice,krezovic/weston,kwm81/weston,Fantu/compositor-spice