fix up test styling and add use-strict declarator

test/fixtures/syntax/classes/super-function-fallback/expected.js

@@ -1,6 +1,9 @@
-var Test = function () {
+"use strict";
+
+var Test = function() {
   var Test = function Test() {
     Function.prototype.hasOwnProperty.call(this, "test");
   };
+
   return Test;
-}();
+}();