print jsx children on newline when we have a multi-line opening element

[tim-dev]

Wrapped JSXElements with long JSXOpeningElements used to look like this:

<div 
  attr1="value1"
  attr2="value2"
  attr3="value3">Inner text here
</div>

This changes it to look like:

<div 
  attr1="value1"
  attr2="value2"
  attr3="value3"
>
  Inner text here
</div>