fix up test styling and add use-strict declarator

test/fixtures/syntax/array-comprehension/arguments/expected.js

@@ -1,8 +1,11 @@
+"use strict";
+
 function add() {
   var _arguments = arguments;
-  return [1, 2, 3].map(function (i) {
+
+  return [1, 2, 3].map(function(i) {
     return i * _arguments[0];
   });
 }
 
-add(5);
+add(5);