Remove redundant test

This behavior is covered by another test in this directory:
`arguments-strict-single.js`. Although the syntax error happens to occur
within the body of a function expression, this distinction is not
significant enough to warrant the test's presence nor does it motivate
the introduction of many similar negative syntax tests which are
currently unavailable.

test/language/statements/variable/12.2.1-14-s.js

-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 12.2.1-14-s
-description: >
-    arguments - a function expr declaring a var named 'arguments'
-    throws SyntaxError in strict mode
-flags: [onlyStrict]
----*/
-
-
-assert.throws(SyntaxError, function() {
-    eval('(function (){var arguments;});');
-});