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/BalrogBattle.js

@@ -41,14 +41,14 @@ var bossMobId = 8830003;
 var eventTime = 60;         // 60 minutes
 var releaseClawTime = 1;
 
-var lobbyRange = [0, 0];
+const maxLobbies = 1;
 
 function init() {
         setEventRequirements();
 }
 
-function setLobbyRange() {
-        return lobbyRange;
+function getMaxLobbies() {
+        return maxLobbies;
 }
 
 function setEventRequirements() {