Fix edit photo link in admin

Ghost Userrequested to merge
fix/photo-open-admin into master

Closes #356 (closed)

Before: In the admin, go to the photos admin -> photos

  1. Click on the link of a photo
  2. Notice that you get an error

After: In the admin, go to the photos admin -> photos

  1. Click on the link of a photo
  2. Photo change admin page opens

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