Extra space in flow type

Input
```
type Test = $ReadOnlyArray<{|
  k: 1
|} | {|
  k: 2
|}>;
```

Output:
```
type Test = $ReadOnlyArray<

    | {|
        k: 1
      |}
    | {|
        k: 2
      |}
>;
```

Note the empty line 2 and excessive indentation.

Parser: either