cogl: Initialize the framebuffer bits on state flush
cogl: Initialize the framebuffer bits on state flush

The place where we actually change the framebuffer is
_cogl_framebuffer_flush_state(), so if we changed to a new frame buffer
we need to initialize the color bits there.

http://bugzilla.openedhand.com/show_bug.cgi?id=2094

spatulasnout/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl,djdeath/cogl-android,spatulasnout/cogl,collects/cogl,djdeath/cogl-android,gcampax/cogl,Distrotech/cogl,collects/cogl,gcampax/cogl,Distrotech/cogl,djdeath/cogl,djdeath/cogl,djdeath/cogl-android,gcampax/cogl,Distrotech/cogl