[MINOR] stats: add href to tracked server

Each server has now a dedicated "a link" tag, so let's use it.
diff --git a/src/dumpstats.c b/src/dumpstats.c
index e51a314..65f6a1c 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -1735,7 +1735,8 @@
 					     svs->counters.down_trans, human_time(srv_downtime(sv), 1));
 				} else if (sv != svs)
 					chunk_printf(&msg,
-					     "<td class=ac colspan=3>via %s/%s</td>", svs->proxy->id, svs->id);
+					     "<td class=ac colspan=3><a class=lfsb href=\"#%s/%s\">via %s/%s<a></td>",
+							svs->proxy->id, svs->id, svs->proxy->id, svs->id);
 				else
 					chunk_printf(&msg,
 					     "<td colspan=3></td>");