#### Keep comments in mapped type inline (#18731 by @fisker)

<!-- prettier-ignore -->
```tsx
// Input
type B = {
  /* comment */ [b in B]: string
};

// Prettier stable
type B = {
  /* comment */
  [b in B]: string;
};

// Prettier main
type B = {
  /* comment */ [b in B]: string;
};
```
