unalias internal wl client pixmaps in elm win hide trap callback

this seems to be the best place to remove the alias since it is initially
added in the corresponding show callback

src/bin/e_win.c

@@ -51,6 +51,10 @@ _e_elm_win_trap_hide(void *data, Evas_Object *o)
    if (!ctx->visible) return EINA_FALSE;
    if (strncmp(ecore_evas_engine_name_get(e_win_ee_get(o)), "wayland", 7))
      E_FREE_FUNC(ctx->pointer, e_object_del);
+#ifdef HAVE_WAYLAND
+   else if (ctx->client)
+     e_pixmap_alias(NULL, E_PIXMAP_TYPE_WL, ecore_wl2_window_surface_id_get(elm_win_wl_window_get(o)));
+#endif
 
    if (!ctx->client) return EINA_TRUE;
    ctx->visible = 0;