RedundantBlockCall ignores class methods

[vlad-pisanov]

Consider:

class C
  def self.foo(&block)
    block.call
  end

  def bar(&block)
    block.call
  end
end

Rubocop flags bar as a RedundantBlockCall offense, but not foo.

---

Expected behavior

Both foo and bar should be flagged as RedundantBlockCall

RuboCop version

1.22.1 (using Parser 3.0.2.0, rubocop-ast 1.12.0, running on ruby 2.6.6 x86_64-darwin20)
  - rubocop-performance 1.11.5