Fix for Reflect's properties having an incorrect scope - #594

This PR does the following:

• Fix an issue where properties of Reflect have their scope incorrectly set to the parent scope of Reflect rather than the Reflect instance itself
• The issue can be seen in this test case:

  var foo = {
    bar: 0
  };
  (Reflect ? Reflect.has : console.log)(foo, 'bar')

  • HtmlUnit 3.0.0 will throw org.htmlunit.ScriptException: TypeError: Method "has" called on incompatible object. since it's trying to execute has() on window object instead of Reflect