zink: use same function for all pipe_context::delete_*_state shader methods

we don't currently do anything special with any of these, so it'd be better
to not have the same code copy/pasted around

Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7485>
1 file changed