Cannot “open” read-only relationship entries

[AlessioGr]

I can edit the above relationships (with that I mean the new edit modal next to the remove button).
However, I cannot click that button for the bottom, read-only relationships.

Now even though it's read-only, I expect to be able to click that button, as it doesn't modify the relationship itself, but only the referenced document.

[jacobsfletch]

@AlessioGr good call! This should be pretty easy to do. We'll slate this into the next iteration of drawer UI: #1668