needsLeopardMailQuirks should be removed
https://bugs.webkit.org/show_bug.cgi?id=113749

Reviewed by Benjamin Poulain.

Removed needsLeopardMailQuirks from settings.in after r147447.

* page/Settings.in:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147517 268f45cc-cd09-0410-ab3c-d52691b4dbfc