BUG/MINOR: stream: also increment the retry stats counter on L7 retries

It happens that the retries stats use their own counter and are not
derived from the stream interface, so we need to update it as well
when performing an L7 retry.

No backport is needed.

src/proto_htx.c

@@ -1397,6 +1397,10 @@ static __inline int do_l7_retry(struct stream *s, struct stream_interface *si)
 	if (si->conn_retries < 0)
 		return -1;
 
+	if (objt_server(s->target))
+		_HA_ATOMIC_ADD(&__objt_server(s->target)->counters.retries, 1);
+	_HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
+
 	req = &s->req;
 	res = &s->res;
 	/* Remove any write error from the request, and read error from the response */