Fix state weirdness in the panel

When QS was open while the we started with expansion, we
immediately notified about expansion finsihed again, which led to all
kinds of weird states. The change that introduced these bugs was to
fix another bug in which onExpandingFinished was not call. Make sure
to call in exactly that case and no other case to not risk
regressions.

Bug: 22806817
Bug: 22807359
Bug: 22807372
Change-Id: Id7daf37ef4a772f724971bf79c61084ff4279f31