change code assertion to 6to5 output

test/fixtures/transformation/esnext-es6-arrow-functions/does-not-bind-this-from-standard-function.js

@@ -1,5 +1,5 @@
 var dynamicThisGetter = () => function () { return this; };
 assert.equal(
-  normalize('('+dynamicThisGetter.toString()+')'),
+  '(' + dynamicThisGetter.toString() + ')',
-  normalize('(function(){ return function(){ return this; }; })')
+  '(function () {\n  return function () {\n    return this;\n  };\n})'
 );