refs a457631a20
- `defaultColumnsToFetch` was moved to the CRUD plugin in the referenced
commit, which makes it a function on `this` instead of `this.prototype`
- this means the function doesn't exist and Admin throws an error when
you start typing in the search bar because the API 500s
- this commit switches it to `this.defaultColumnsToFetch()`
refs https://github.com/TryGhost/Team/issues/808
- see referenced issue for context, but turning this function into
async-await seems to have broken error handling when deleting things
that don't exist
- i'm really not sure why - but my running theory is that it's something
to do with Bluebird Promises vs native Promises
- this should keep the same functionality until I can investigate what
is going on
