vo_opengl: fall back to ordered dither instead of blowing up

In GLES 2 mode, we can do dither, but "fruit" dithering is still out of
the question, because it does not support any high depth textures.
(Actually we probably could use an 8 bit texture too for this, at least
with small matrix sizes, but it's still too much of a pain to convert
the data, so why bother.)

This is actually a regression; before this, forcibly enabling dumb mode
due to low GL caps actually happened to avoid this case.

Fixes #4519.

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