Improve linter rule for useless overriding methods

Summary: Ref T7409. This linter rule was added in D12419, but fails in some specific cases. Improve the handling of n_DECLARATION_PARAMETER_LIST.

Test Plan: Added unit tests.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7409

Differential Revision: https://secure.phabricator.com/D12828