When custom `slug_column` is used along with `history` and
`sequentially_slugged` modules, wrong query was being formed on `Slug`
model.

Query being made - `select friendly_id_slugs.strange name from artists`
Query which should be made - `select friendly_id_slugs.slug from artists`

This commit fixes it to use default `slug` column in such case.

A method name with `and` is usually an indicator that it does too much