Tighten up the KG transport control layout for stability

Decrease margin between elements to allow the transport controls to
fully fit within the space allotted on some devices. This prevents
unwanted resizing and shuffling when the challenge is swiped downward
to make more room for the current widget page.

Also remove some unused views from features not currently supported.

Bug 11158270

Change-Id: Id5b19a9399760e291495a16def315c7ad6437450