zink: be more consistent about applying module hash for gfx pipeline

zink: be more consistent about applying module hash for gfx pipeline

this was a little spaghetti-ish: the module hash was sometimes being applied
during module update, sometimes in draw during program create, and then also
it was removed when a shader unbind would cause the program to no longer be reachable

now things are more consistent:
* keep removing module hash when program becomes unreachable
* only apply module hash in draw during updates there

cc: mesa-stable

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13727>