Formatter respects comments in tuple keyword syntax

[sabiwara]

Without this, the following

{
  :foo,
  # before 1
  one: 1,
  # before 2
  two: 2
}

gets rewritten as

{
  :foo,
  # before 1
  # before 2
  one: 1, two: 2
}

Unlike

[
  :foo,
  # before 1
  one: 1,
  # before 2
  two: 2
]

which stays as is.

With this fix, the first example is untouched as well.

Context: this can be annoying when trying to comment options within child specs.

Feel free to close if we don't want this, it might cause unwarranted changes judging on the make format changes.

[sabiwara]

OK I don't think this is the right fix, closing for now.