Update Broken_BrickLimit.cs

-Fixed pref registration (syntax error) - you cannot call functions directly inside a package

-Optimized detection for when the player plants a brick (changed fxDTSBrick::onPlant to serverCmdPlantBrick)- will not let the client plant the brick AT ALL (not even for a few milliseconds) now, if the brick limit is reached

-Added check for Return To Blockland preference registration system

-Added guard to check if the preference(s) have already been registered or not