Save kanshi snapshot ahead of mode removal

src/outputs.c

@@ -400,6 +400,9 @@ static void mode_handle_preferred(void *data,
 static void mode_handle_finished(void *data,
     struct zwlr_output_mode_v1 *wlr_mode) {
   struct wd_mode *mode = data;
+#ifdef WITH_KANSHI
+  wd_save_kanshi_snapshot(mode->head->state);
+#endif
   wl_list_remove(&mode->link);
   wd_mode_destroy(mode);
 }