fix up test styling and add use-strict declarator

test/fixtures/syntax/classes/instance-getter/actual.js

@@ -1,5 +1,5 @@
 class Test {
   get test() {
-    return 5 + 5;
+  return 5 + 5;
   }
 }

test/fixtures/syntax/classes/instance-getter/expected.js

@@ -1,11 +1,15 @@
-var Test = function () {
-  var Test = function Test() { };
+"use strict";
+
+var Test = function() {
+  var Test = function Test() {};
+
   Object.defineProperties(Test.prototype, {
     test: {
-      get: function () {
+      get: function() {
         return 5 + 5;
       }
     }
   });
+
   return Test;
-}();
+}();