Fix the cancel from overflow test

There's a bug in S where if you cancel all the bubbles
from an app and there isn't anything else in the overflow
from other apps, then we'll reload things from XML.
I'm not super confident there won't be other side effects
from my fix so I want to do that in v2.

This modification in CtsVerifier test ensures the test
works as it should.

Test: flash wipe your device and perform the CtsVerifier
      bubbles tests
Bug: 193380534
Change-Id: I3531f2ffc0cfb74b206b88f92431c2799fac338c
1 file changed