Update the sizes for bubble expanded view

* 16dp on either side / from edge of screen for the bubble view
* 16dp between bubble row & expanded bubble rect (works out to 5dp
  in code: 16dp - 2dp (badge overhang) - 9dp (pointer height)
* max 8dp between the bubbles in the top row
* manage button has some adjustments - 8dp above & below and is total
  32dp from edge of screen; ensure manage button is centered between
  bottom inset & bottom of expanded view

* fixes a bug where there was extra padding being at top of expanded
  view in landscape mode
* removed an unused layout file & unused dimens

Test: visual - expand a bubble, look at spacing of everything on
               screen; do the same in landscape from left and right
               edges of the screen.
Bug: 187715439
Bug: 183658029
Change-Id: I29e699aaf9b6e7bf75447dac6aa6b00a7b272b8b