turnip/ci: Remove fixed test from a660 xfails

It appears this was missed due to fractional runs, but the fix for this issue has already been merged.
While the test hasn't run in the full runs yet, it should now be considered fixed, just like on other GPUs.

Fixes: 812c8f6abe4 ("tu: Treat partially-bound depth/stencil attachments as passthrough")
Signed-off-by: Valentine Burley <valentine.burley@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31286>
1 file changed