- Fix some chat issues

- Remove plugin field

src/de/anura/core/events/PlayerChat.java

@@ -12,18 +12,16 @@ public class PlayerChat implements Listener {
 
     public PlayerChat(AnuraCore plugin) {
         plugin.getServer().getPluginManager().registerEvents(this, plugin);
-        this.plugin = plugin;
     }
 
     @EventHandler
     public void onPlayerChat(AsyncPlayerChatEvent event) {
         try {
             if (event.isAsynchronous()) {
-                event.setFormat(event.getPlayer().getDisplayName() + ChatColor.GRAY + ":" + ChatColor.WHITE + " " + event.getMessage());
+                event.setFormat("%s" + ChatColor.GRAY + ":" + ChatColor.WHITE + " %s");
             }
         } catch(IllegalFormatException | NullPointerException e) {
             Errors.reportException(e);
         }
     }
-    private final AnuraCore plugin;
 }