…ixes beautifier#538)

- Move several tests not involving brace positions out of the brace position testing
  section, and eliminate duplication
- Ensure parallel tests exist for all 3 brace styles
- Add comments to clarify the sections are testing brace positions
- Move copy-pasted, commented out test up to opening brace position tests comment,
  and add note to update tests correctly if the case is ever supported.

Each removed test was an exact duplicate of the test 5 lines before it

looks very similar to what I plan to implement in my next commit

Abstracts out the opening and closing whitespace before opening braces
and before closing braces, respectively, so that the tests are all written in
one place instead of 4 huge blocks, 1 for each brace style.

…n Python version