Open QS when swiping from status bar in power menu

When there is a downward scroll or fling event that starts in the status bar
area, close the power menu and open the shade (QS if on lockscreen,
notification shade otherwise, to match behavior outside of power menu)
Single tap anywhere outside the dialog will still close it.

Fixes: 190506673
Test: manual
Test: atest GlobalActionsDialogLiteTest
Change-Id: I32239e1751e0e6f14a09e9ab6727e685e8af1008