opengl: renderer: do not enable GL_CULL_FACE

The OpenGL states must not be set on Open, but on each Draw call if
necessary (they may impact other filters).

In practice, it is not necessary to set them at all:
 - GL_CULL_FACE is useless for the renderer;
 - the other states are assumed to be the default values in all other
   filters.

Suggested-by: Niklas Haas <git@haasn.dev>