opengl32: Don't prioritize low bit depth formats with non-matching stencil.
Fixes ClaDun X2 missing rendering parts on AMD. The GL game uses stencil and requests pixel format with depth 16, stencil 8. On Wine / AMD that ends up with 16x0 format as there is no 16x8 advertised (16x0 only) and depth takes absolute priority. On the same Windows machine I see both 16x0 and 16x8 formats, but when 16x8 is requested 24x8 is returned (and 16x0 if 16x0 is requested).
That currently works under Wine / Nvidia because there is no 16 bit depth formats advertised at all and it ends up with 24x8 without this patch.