gui.topbar: fix args in call to Gtk.Menu.popup

The call was missing either the arguments for time or for user data.
Call is now consistent with the other (except for time/button args).

The previous bindings may have been more lenient about missing
parameters, but that has not been the case since at least v1.2.0
going by issue #1099

Not sure if this codepath can even be triggered anymore, but might as
well fix it, in case opening the menu w. keys is made possible again.

Closes #1099

gui/topbar.py

@@ -257,7 +257,14 @@ def _togglebutton_toggled_cb(self, togglebutton):
         if togglebutton.get_active():
             if not self.menu.get_property("visible"):
                 pos_func = self._get_popup_menu_position
-                self.menu.popup(None, None, pos_func, 1, 0)
+                self.menu.popup(
+                    parent_menu_shell=None,
+                    parent_menu_item=None,
+                    func=pos_func,
+                    data=None,
+                    button=1,
+                    activate_time=Gdk.CURRENT_TIME,
+                )
 
     def _menu_dismiss_cb(self, *a, **kw):
         """Reset the button state when the user's finished