Always reset focusedTask to -1 on reset

- Keep old focused task causes old focused task to be restored after applyLoadPlan: http://cs/android/packages/apps/Launcher3/quickstep/src/com/android/quickstep/views/RecentsView.java?l=1365
- This caused the nth task to be focused rather than the first task
- The fix is to reset focusedTask in reset when exiting overview, focused task will be set properly next time through applyLoadPlan when overview is relaunched

Fix: 199150523
Fix: 198420226
Test: TaplTestsNexus.testOverviewActions
Test: Quick switch > launch app > swipe home > swipe up to overview > snap to focused task
Test: split screen > swipe home > swipe up to overview > snap to focused task
Change-Id: I06399626ed3ee033345bd67296d79d59a98a507f
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 3b962d8..b690982 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -1866,7 +1866,7 @@
         setCurrentTask(-1);
         mIgnoreResetTaskId = -1;
         mTaskListChangeId = -1;
-        mFocusedTaskViewId = getTaskViewCount() > 0 ? getTaskViewAt(0).getTaskViewId() : -1;
+        mFocusedTaskViewId = -1;
 
         if (mRecentsAnimationController != null) {
             if (ENABLE_QUICKSTEP_LIVE_TILE.get() && mEnableDrawingLiveTile) {