merge X11Managed and X11Unmanaged into X11

now that client_is_unmanaged() checks the wlr struct we don't need to keep
track of it ourselves

client.h

@@ -10,7 +10,7 @@ static inline int
 client_is_x11(Client *c)
 {
 #ifdef XWAYLAND
-	return c->type == X11Managed || c->type == X11Unmanaged;
+	return c->type == X11;
 #endif
 	return 0;
 }