Prevent user-initiated map menu changes during menu animations

This makes it so it's not even possible to stay on the TELEPORTERMODE
screen by opening the map while it's being brought down. It also makes
it so the map animation is able to be canceled when being brought up
just by opening the map and closing it.

Fixes #833.

desktop_version/src/Script.cpp

@@ -1115,7 +1115,7 @@ void scriptclass::run(void)
 			{
 				if (words[1] == "teleporter")
 				{
-					game.mapmenuchange(TELEPORTERMODE);
+					game.mapmenuchange(TELEPORTERMODE, false);
 
 					game.useteleporter = false; //good heavens don't actually use it
 				}