[Fix #6974] Make Layout/FirstMethodArgumentLineBreak aware of calling using super

[koic]

Fixes #6974.

This PR makes Layout/FirstMethodArgumentLineBreak aware of calling using super.

# example.rb
super(:foo,
  :bar
  )

Before

% rubocop --only Layout/FirstMethodArgumentLineBreak
Inspecting 1 file
.

1 file inspected, no offenses detected

After

% rubocop --only Layout/FirstMethodArgumentLineBreak
Inspecting 1 file
C

Offenses:

example.rb:1:7: C: Layout/FirstMethodArgumentLineBreak: Add a line break
before the first argument of a multi-line method argument list.
super(:foo,
      ^^^^

1 file inspected, 1 offense detected

---

Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[Drenmi]

🚀