This rule was added in rubocop-rails 2.25.0. Applying it allows us to
simplify the code a little bit. For example, now there's no need to
specify the `proposals` table in proposal scopes, which was actually
causing a bug in the `Legislation::Proposal` model, which was using the
`proposals` table instead of the `legislation_proposals` table (but,
since we don't use this scope, it didn't affect the application).
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