`multiElementCollectionTrailingCommas` adds comma to line comment when element is a ternary operator

[ahoppen]

[
  1,
  true ? 1 : 2 // some comment
]

Gets formatted to

[
  1,
  true ? 1 : 2  // some comment,
]

Adding the comma to the comment instead of after 2.

rdar://133862349