Fix bug with Taskbar not differentiating between user profiles

This patch fixes a bug where Taskbar would not differentiate between user profiles when selecting an app to launch from Overview.

The bug occurred because findLastActiveTaskAndRunCallback(), which checks for already-running tasks when launching an app from the Taskbar, only checks for a ComponentName match and not a userId match.

Fixed by making the findLastActiveTaskAndRunCallback() also check for a userId match.

Fixes: 270456926
Test: Manual
Change-Id: I43ff06083a5dce775fdbd0b0ed951beaae34c0ab