Make /mcnotify match the process of the other commands for getting the

mcMMOPlayer object.

src/main/java/com/gmail/nossr50/commands/McnotifyCommand.java

@@ -3,7 +3,6 @@ package com.gmail.nossr50.commands;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
-import org.bukkit.entity.Player;
 
 import com.gmail.nossr50.datatypes.player.McMMOPlayer;
 import com.gmail.nossr50.locale.LocaleLoader;
@@ -14,7 +13,7 @@ public class McnotifyCommand implements CommandExecutor {
     public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
         switch (args.length) {
             case 0:
-                McMMOPlayer mcMMOPlayer = UserManager.getPlayer((Player) sender);
+                McMMOPlayer mcMMOPlayer = UserManager.getPlayer(sender.getName());
 
                 if (mcMMOPlayer.useChatNotifications()) {
                     sender.sendMessage(LocaleLoader.getString("Commands.Notifications.Off"));