Fix the dot, yet again

The showDot logic should basically follow the showInShade logic, they
only differ due to DND rules. Whenever I added the showDot stuff I missed
this bit in following the showInShade logic.

Added some tests for it too.

Test: atest BubbleControllerTest
Bug: 137213469
Change-Id: I5aa56ca8c08d5e1bdefc2e39d00bd08616b42091