Run clan-load callbacks on the main thread

This prevents potential CMEs from occurring when a player transfers
his/her clan to another server

Plugins/Mineplex.Game.Clans/src/mineplex/game/clans/clans/ClansDataAccessLayer.java

@@ -806,7 +806,7 @@ public class ClansDataAccessLayer
 			public void run()
 			{
 				ClanToken clan = _repository.retrieveClan(clanName);
-				callback.run(clan);
+				runSync(() -> callback.run(clan));
 			}
 		});
 	}