Update the bubble overflow to match new visuals

* The overflow has a more restricted size than previous and this size
  should be used even on large screens, not just in phone landscape.
* Updates the padding between columns & rows in the overflow view
* Reduces the line length of items in the overflow

Test: visual - look at overflow on large tablet, small tablet and
               phone across configurations
Bug: 217211205
Change-Id: I8fe8b0bd8b6c07393583d81540506a74eaa4fc10