Revert "Halo: Add master switch to disable Halo (1/2)"

Change-Id: I588c4b49eabb0ef20b3d0ec2996d896a5ab06c63
Give floating flag to previous activities in the stack
When launching stacked activities, only the last one is flagged as floating in sysui when tapping halo.
This causes the system to show the launcher when the first stacked activity is launched (this first intent gets the flag FLAG_ACTIVITY_TASK_ON_HOME
in TaskStackBuilder).
This change makes all the stacked activities get the floating flag if the last one has it.