Don't fake snippet mode when fetching external socket connector if

running mode is proxy. re: #625

lib/browser-sync.js

@@ -468,7 +468,9 @@ BrowserSync.prototype.getExternalSocketConnector = function (opts) {
     return connectUtils.socketConnector(
         bs.options.withMutations(function (item) {
             item.set("socket", item.get("socket").merge(opts));
-            item.set("mode", "snippet");
+            if (bs.options.get("mode") !== "proxy") {
+                item.set("mode", "snippet");
+            }
         })
     );
 };