Fix a couple of mistakes with dots & summaries

* When dismissing a single bubble the notification got removed when
  it shouldn't be (because single bubble also considered summary)
* The dot being shown should be based on showBubbleDot, not showInShade
* Remove debug statement I never intended to check in! The entry shouldn't
  be null so it should be fine to assume non-null... if it is null we should
  break because something weird would be going on

Test: manual - dismiss a bubble, notice notification stays in shade
Bug: 138659213
Change-Id: I30c3666ff14c7d7ec5b6b461e5f50bc7460328e6