Flow: Print dangling comments for empty inexact object type

[sosukesuzuki]

Fixes #7718

The following comments cannot be formatted in this PR:
Input:

type Foo = {
  // comment0
  ...,
  // comment1
};

Output:

type Foo = {
  // comment0
  // comment1
  ...,
};

Expected:

type Foo = {
  // comment0
  ...,
  // comment1
};

It is hard to format this because there was not much information about inexact in the AST. But, since this is an edge case, I don't think this is a problem.

• I’ve added tests to confirm my change works.
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/pr-XXXX.md file following changelog_unreleased/TEMPLATE.md.
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