Update statusBarHeight & bubblePaddingTop on config change

* Status bar height can change and we're not accounting for it
* Introduces landscape value of bubblePaddingTop that is smaller so
  that there is more space for app content in landscape

Bug: 135487618
Test: manual - requires changes in other CL's in stack, but then:
             - have bubbles, expand stack
             - rotate device
             => notice that spacing between status bar + expanded view
                is smaller in landscape & larger in portrait
Change-Id: Ib6e98c7ee51408fb8bb51ecb3b4875fc618de8b3