Bindings generation tests are failing
https://bugs.webkit.org/show_bug.cgi?id=118877

Reviewed by Kentaro Hara.

I inadvertently removed the wrong part of the if statement
in r152845, causing hasAttribute() to be used unconditionally
for reflected boolean attributes instead of fastHasAttribute().
This patch fixes the issue.

No new tests, covered by bindings tests.

* bindings/scripts/CodeGenerator.pm:
(GetterExpression):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@152886 268f45cc-cd09-0410-ab3c-d52691b4dbfc