systray: Don't set WM_STATE on embedded windows (FS#1246)

Apparently there is no spec which requires doing this and other systray
implementations do not do this.

Signed-off-by: Uli Schlachter <psychon@znc.in>

systray.c

@@ -164,7 +164,6 @@ systray_request_handle(xcb_window_t embed_win, xembed_info_t *info)
 
     xcb_change_window_attributes(globalconf.connection, embed_win, XCB_CW_EVENT_MASK,
                                  select_input_val);
-    xwindow_set_state(embed_win, XCB_ICCCM_WM_STATE_WITHDRAWN);
 
     /* we grab the window, but also make sure it's automatically reparented back
      * to the root window if we should die.