Fix Layout/RedundantLineBreak adding extra space within method chains

[dvandersluis]

When Layout/RedundantLineBreak finds a multiline method chain that can be collapsed to a single line, it adds an extra space between each method. Although the spaces could also be detected by Layout/SpaceAroundMethodCallOperator, this change allows the cop to calculate if a correction will fit on the line better (as demonstrated by the fixes in the 2nd commit).

foo.
  bar.
  baz

Before:

foo. bar. baz

After:

foo.bar.baz

---

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.

[jonas054]

Found a potential problem. Looks fine otherwise.

[koic]

Thanks!

[jonas054]

Nice!