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/3rdJob_mount.js

@@ -32,10 +32,10 @@ var eventMaps = [923010000];
 
 var eventTime = 5; //5 minutes
 
-var lobbyRange = [0, 7];
+const maxLobbies = 7;
 
-function setLobbyRange() {
-    return lobbyRange;
+function getMaxLobbies() {
+    return maxLobbies;
 }
 
 function init() {