Tray: Let dbus call end and reply to caller

Depending on timing we may never send a reply to the caller if we restart
immediately.

blueman/main/Tray.py

@@ -24,8 +24,9 @@ def do_quit(_: object) -> bool:
 
     def do_activate(self) -> None:
         if self._active:
+            GLib.timeout_add_seconds(1, lambda: os.execv(sys.argv[0], sys.argv))
             logging.info("Already running, restarting instance")
-            os.execv(sys.argv[0], sys.argv)
+            return
 
         Gio.bus_watch_name(Gio.BusType.SESSION, 'org.blueman.Applet', Gio.BusNameWatcherFlags.NONE,
                            self._on_name_appeared, self._on_name_vanished)