[Fix #7928] Fix a false message for Style/GuardClause

[koic]

Fixes #7928.

This PR fixes a false message for Style/GuardClause when using and or or operators for guard clause in then or else branches.

The following is an example:

% cat example.rb
if cond
  foo || raise('hi')
else
  bar
end

Before

% bundle exec rubocop --only Style/GuardClause
(snip)
Offenses:

example.rb:1:1: C: Style/GuardClause: Use a guard clause (raise('hi') if cond) instead of wrapping the code inside a conditional expression.
if cond
^^

1 file inspected, 1 offense detected

After

% bundle exec rubocop --only Style/GuardClause
(snip)

Offenses:

example.rb:1:1: C: Style/GuardClause: Use a guard clause (foo || raise('hi') if cond) instead of wrapping the code inside a conditional
expression.
if cond
^^

1 file inspected, 1 offense detected

---

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• 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.