st/mesa: check the texture image level in st_texture_match_image
Otherwise, 1x1 images of arbitrarily high level are accepted. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96639#add_comment Cc: 11.2 12.0 <mesa-stable@lists.freedesktop.org> Reviewed-by:Ilia Mirkin <imirkin@alum.mit.edu>