clang-format: [JS] Fix incorrect detection of ternary expressions.

clang-format: [JS] Fix incorrect detection of ternary expressions.

A definintion like this could not be formatted at all:
  constructor({aa}: {
    aa?: string,
    aaaaaaaa?: string,
    aaaaaaaaaaaaaaa?: boolean,
    aaaaaa?: List<string>
  }) {
  }

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@238291 91177308-0d34-0410-b5e6-96231b3b80d8