Show protection log on creation-protected pages

This change would add the message 'titleprotectedwarning'
to pages that have been protected against creation, just
like how deleted pages have their log visible beforere-creation.
It is visible to everyone, whether or not they are allowed to
recreate the page.

Bug: T171338
Change-Id: I5acf1bee9cea056b20b77fd386bc9df65033cded