Refactor event max lobbies - is no longer a range

It's no longer a range because it:
1. Makes no sense for it to be a range
2. Makes for simpler scripts since returning a JS array is a hassle with Graal

scripts/event/MahaBattle.js

@@ -33,7 +33,7 @@ var maxMapId = 914020000;
 
 var eventTime = 10;     // 10 minutes
 
-var lobbyRange = [0, 7];
+const maxLobbies = 7;
 
 function init() {}