util: Fix translate from block compressed to rgba

util: Fix translate from block compressed to rgba

Since
2b5178ee util: Switch the non-block formats to unpacking rgba rows instead of rects,
compressed formats define unpack_rgba_8unorm_rect instead
of unpack_rgba_8unorm.

Fixes the u_format_translate check to take this into account.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5201
Fixes: 2b5178ee ("util: Switch the non-block formats to unpacking rgba rows instead of rects")

Signed-off-by: Axel Davy <davyaxel0@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12315>