Added the failure block to saveNotificationSettings call in NotificationSettingsScreen..

git-svn-id: http://ios.svn.wordpress.org/trunk@4064 7d847f7c-ffe1-4a24-85be-b788d016d96a
Added the failure block to the saveNotificationSettings call in EditSiteScreen..

git-svn-id: http://ios.svn.wordpress.org/trunk@4065 7d847f7c-ffe1-4a24-85be-b788d016d96a