gl/msaa: blit texture to renderbuffer if msaa is not active

We need to rebind to msaa fbo when msaa is not active, even the content
between texture and renderbuffer are synced
gl/msaa: text rendering does not need target in msaa_active state

text image is already AAed.  There is no need to blit dst from texture
to renderbuffer
gl: do not translate source in text rendering

the source has been transformed before gl backend receives.  Do not
transform again when rendering via mask