fix duplicated tray icons after slow reloading of some X window manager (#765)

A workaround to fix #764 . The embedded status can keep false for a while during reloading of some X window manager (system tray included). The every-10-sec icon status checking may hit this time slice and create duplicated tray icons.

Author: Tao-T

bin/shutter

@@ -778,6 +778,9 @@ sub STARTUP {
 		fct_try_init_tray();
 		Glib::Timeout->add(10000, sub {
 			if (!$tray_legacy || !$tray_legacy->is_embedded) {
+				if ($tray_legacy) {
+					$tray_legacy->set_visible(0);
+				}
 				fct_try_init_tray();
 			}
 			return TRUE;