Also enable "CurrentColorTest.Set/*" tests.

Bug: angleproject:6049
Change-Id: I65e62b6c0805687ad6744a12217e0c08bc97ca1a
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2954262
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>