FormRefresh: Set global on RequestContextCreateSkin too

Id50a97d63286890e107a268f5d53f13b0b152360 switched to using
'MediaWikiPerformAction' which is only run on actions thus
breaking it for all Special pages. We need to check if the
feature is enabled on both-
 * MediaWikiPerformAction
 * RequextContextCreateSkin

Bug: 71526
Change-Id: I96d6218d57e47a0eb02f39bff527e63227bd1b60