[Fix #10563] Fix Style/BlockDelimiters unexpectedly deletes block

[nobuyo]

...on moving comment if methods with block are chained.

Fixes #10563.

This PR fixes Style/BlockDelimiters not correctly looking for the end of method chain with block. (The test is passing, but I'm worry about it's not destroying the other cases.)

---

Before submitting the PR make sure the following are checked:

• 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).
• Feature branch is up-to-date with master (if not - rebase it).
• 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.

[koic]

Thanks!