Error connection instead of reconnecting

Reconnection attempts are expected to be handled by libpurple and not by the protocol plugin, so it is visible to the user when the connection is not working.

tgp-net.c

@@ -349,6 +349,7 @@ static void restart_connection (struct connection *c) {
   }
   
   connection_data *conn = TLS->ev_base;
+  purple_connection_error_reason (conn->gc, PURPLE_CONNECTION_ERROR_NETWORK_ERROR, "Lost connection with server");
   // c->prpl_data = purple_proxy_connect (conn->gc, conn->pa, c->ip, c->port, net_on_connected, c);
 }