Don't test depth stencil formats in color formats tests

[beaufortfrancois]

"color formats must be renderable" test fails because depth stencil format were added in 840ff3f#diff-a4c78fe12bb75d8679eab0ed0211c06d while they were not part of the original test.

[kainino0x]

Whoops. I think we should still test them - just add the necessary metadata to the format info table so we can say "should error". (e.g. color: boolean or something)

[beaufortfrancois]

Do you have a fix already or should I assign it to me now?