Removed unused code in Settings Controller.

git-svn-id: http://ios.svn.wordpress.org/trunk@4011 7d847f7c-ffe1-4a24-85be-b788d016d96a
Fixes #1536 by adding the toggle UI element that turns ON/OFF the PN setting for the selected blog.

git-svn-id: http://ios.svn.wordpress.org/trunk@4012 7d847f7c-ffe1-4a24-85be-b788d016d96a