Fix formatting of switch expressions that contain brace cases inside

[ah-yu]

Formatter adds a blank line after braced case, which seems to be a regression introduced in v10

switch foo {                             
| 1 => {
    Js.log(1)
    Js.log(2)
  } 

| 2 => Js.log(3)
}

[cristianoc]

Thanks you for the fix.
Perhaps this could be added to the 10.1 branch as well.