Fix Mac-specific compiler warning in Mac screensaver

clientscr/Mac_Saver_ModuleView.m

@@ -1,6 +1,6 @@
 // This file is part of BOINC.
 // http://boinc.berkeley.edu
-// Copyright (C) 2020 University of California
+// Copyright (C) 2022 University of California
 //
 // BOINC is free software; you can redistribute it and/or modify it
 // under the terms of the GNU Lesser General Public License
@@ -1277,7 +1277,7 @@ kern_return_t _MGSDisplayFrame(mach_port_t server_port, int32_t frame_index, mac
 
 - (void)update
 {
-//    [super update];
+    [super update];
 	// Override to do nothing.
 }