Added /favicon.ico handler

go/weed/weed_server/volume_server_handlers.go

@@ -51,3 +51,7 @@ func (vs *VolumeServer) publicReadOnlyHandler(w http.ResponseWriter, r *http.Req
 		vs.GetOrHeadHandler(w, r)
 	}
 }
+
+func (vs *VolumeServer) faviconHandler(w http.ResponseWriter, r *http.Request) {
+	vs.FaviconHandler(w, r)
+}