Remove time syncer checks

This check has caused more harm than good (with needing to use an external NTP source and some providers not allowing Cloudflare's NTP server), and is also a technical vulnerability in BungeeGuard. In order to exploit this, you would need to capture traffic between the Geyser server and the Floodgate instance.

velocity/src/main/java/org/geysermc/floodgate/addon/data/VelocityProxyDataHandler.java

@@ -141,10 +141,6 @@ public final class VelocityProxyDataHandler extends ChannelInboundHandlerAdapter
                     ctx.channel().attr(kickMessageAttribute)
                             .set(config.getDisconnect().getInvalidArgumentsLength());
                     return;
-                case TIMESTAMP_DENIED:
-                    ctx.channel().attr(kickMessageAttribute)
-                            .set(Constants.TIMESTAMP_DENIED_MESSAGE);
-                    return;
                 default: // only continue when SUCCESS
                     return;
             }