chatgui: fix RTT display 10x overstatement (DB stores 0.1ms, displayed as ms); remove unused rtt_avg_100

src/control_server.c

@@ -1064,7 +1064,6 @@ static void send_metrics(struct control_server* server, struct control_client* c
     rsp->etcp.peer_node_id = conn->peer_node_id;
     rsp->etcp.rtt_last = conn->rtt_last;
     rsp->etcp.rtt_avg_10 = conn->rtt_avg_10;
-    rsp->etcp.rtt_avg_100 = conn->rtt_avg_100;
     rsp->etcp.jitter = conn->jitter;
     rsp->etcp.bytes_sent_total = conn->bytes_sent_total;
     rsp->etcp.retrans_count = conn->retransmissions_count;