Remove unused ManagedWindow modal_call method

This was used only once in AddMedia, which has been upgraded to use
the ManagedWindow "modal=" parameter on init instead.

gramps/gui/managedwindow.py

@@ -533,39 +533,6 @@ class ManagedWindow:
             self.opened = True
             self.window.show_all()
 
-    def  modal_call(self, after_ok_func=None):
-        """
-        This is deprecated; use the 'modal=True' on the ManagedWindow
-        initialization for new work.
-
-            Method to do modal run of the ManagedWindow.
-            Connect the OK button to a method that checks if all is ok,
-                Do not call close, close is called here.
-                (if not ok, do self.window.run() to obtain new response )
-                TODO: remove close here and do close in ReportDialog,
-                      this can only be done, once all methods use modal_call()
-                      instead of their own implementation
-            Connect Cancel to do close, delete event is connected to close
-                here in ManagedWindow.
-            Do not generete RESPONSE_OK/CANCEL/DELETE_EVENT on button clicks
-            of other buttons
-            after_ok_func is called on ok click in this method
-        """
-        #self.show()
-        while True:
-            response = self.window.run()
-            if response == Gtk.ResponseType.OK:
-                # dialog will be closed by connect, now continue work while
-                # rest of dialog is unresponsive, release when finished
-                self.close()
-                if after_ok_func is not None:
-                    after_ok_func()
-                break
-            elif (response == Gtk.ResponseType.DELETE_EVENT or
-              response == Gtk.ResponseType.CANCEL):
-                # connect buttons generating this to a close call
-                break
-
     def close(self, *obj):
         """
         Close itself.