Fix wl_shell popup livelock

Trying to put wl_shell popups in the popup layer results in stacking
problems later and a never ending loop.

Just don't.

fix T3433

src/modules/wl_desktop_shell/e_mod_main.c

@@ -341,7 +341,6 @@ _e_shell_surface_cb_popup_set(struct wl_client *client EINA_UNUSED, struct wl_re
    ec->changes.icon = !!ec->icccm.class;
    ec->netwm.type = E_WINDOW_TYPE_POPUP_MENU;
    ec->comp_data->set_win_type = EINA_TRUE;
-   ec->layer = E_LAYER_CLIENT_POPUP;
 
    /* set this client as a transient for parent */
    _e_shell_surface_parent_set(ec, parent_resource);