Fix an incorrect autocorrect for Rails/Presence when a right-hand side of the relational operator

[ydah]

This PR fixes an incorrect autocorrect when there is right-hand side of the relational operator as follows:

a < if b.present?
  b
else
  c
end

Expect autocorrect

a < (b.presence || c)

Actual autocorrect

a < b.presence || c

---

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• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• [-] Commit message starts with [Fix #issue-number] (if the related issue exists).
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• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
• [-] If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[ydah]

I updated this PR. Thank you so much.

[koic]

Thanks!