Remove unused code in TokenServerHandler#channelActive (#1667)

Signed-off-by: cj <power4j@outlook.com>

sentinel-cluster/sentinel-cluster-server-default/src/main/java/com/alibaba/csp/sentinel/cluster/server/handler/TokenServerHandler.java

@@ -47,7 +47,6 @@ public class TokenServerHandler extends ChannelInboundHandlerAdapter {
     @Override
     public void channelActive(ChannelHandlerContext ctx) throws Exception {
         globalConnectionPool.createConnection(ctx.channel());
-        String remoteAddress = getRemoteAddress(ctx);
     }
 
     @Override