🐛 Fixed meta schema for 'page' context in dynamic routing
🐛 Fixed meta schema for 'page' context in dynamic routing

refs #10082

- When specifying an existing page as an allias for collection, e.g: `data: page.it-is-a-page` it was failing to generate metadata

Kikobeats/Ghost,e10/Ghost,bitjson/Ghost,kevinansfield/Ghost,janvt/Ghost,Kikobeats/Ghost,e10/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,ErisDS/Ghost,JohnONolan/Ghost,TryGhost/Ghost,janvt/Ghost,bitjson/Ghost,JohnONolan/Ghost,ErisDS/Ghost,TryGhost/Ghost,ErisDS/Ghost,kevinansfield/Ghost,TryGhost/Ghost,Kikobeats/Ghost