xwayland/glamor: Try manual redirect only if parent window has depth 32
That's the case 8e8bc0a1 ("xwayland: Try manual redirection for surface window in glamor_check_flip") was intended for. If the parent window doesn't have depth 32, the automatic redirection might have been done by a client, in which case doing the manual redirection may run into trouble.
Fixes: 8e8bc0a1 ("xwayland: Try manual redirection for surface window in glamor_check_flip") Closes: #1724 (closed)