PageType.TypeS -> PageType.FriendlyId

/api/page/* outputs urls as:
  /{{PageType.TypeS.toLower}}/{{Page.FriendlyId}}
when it should be
  /{{PageType.FriendlyId}}/{{Page.FriendlyId}}
which leads to, e.g., the link button in the editor creating dead links if your FriendlyId and TypeS differ. This commit changes to the latter format, which is how the routing works.