Improve quick switch from home to taskbar

- Add LauncherState#isTaskbarAlignedWithHotseat() which defaults to !isTaskbarStashed(), but is always false for quick switch from home
- Replaced FLAG_TRANSITION_STATE_START_STASHED and FLAG_TRANSITION_STATE_COMMITTED_STASHED with FLAG_STATE_TRANSITION_RUNNING and a reference to mLauncherState. STATE_START is equivalent to TRANSITION_RUNNING changing to true, and STATE_COMMITTED is equivalent to TRANSITION_RUNNING changing to false. Then can get details from the state such as whether taskbar is stashed and icon alignment from mLauncherState

Test: quick switch from home, both with taskbar stashed in apps and not
Fixes: 194728611
Bug: 204657916
Change-Id: I6cf84ec73a4036e14cc7268667c6f62100884c27