Fix stalled gesture navigation tutorial.

Touching the screen after completing the gesture removed all callbacks, preventing the tutorial to progess. Added logic to only remove logic if the gesture is incomplete.

Fixes: 198285152
Test: manual, touched screen and attempted all gestures after completing a step
Change-Id: I320b13cd9b7632a9fb722bc10d3d0a96dc111144

quickstep/src/com/android/quickstep/interaction/HomeGestureTutorialController.java

@@ -48,7 +48,7 @@ final class HomeGestureTutorialController extends SwipeUpGestureTutorialControll
 
     @Override
     public void onBackGestureAttempted(BackGestureResult result) {
-        if (mGestureCompleted) {
+        if (isGestureCompleted()) {
             return;
         }
         switch (mTutorialType) {
@@ -73,7 +73,7 @@ final class HomeGestureTutorialController extends SwipeUpGestureTutorialControll
 
     @Override
     public void onNavBarGestureAttempted(NavBarGestureResult result, PointF finalVelocity) {
-        if (mGestureCompleted) {
+        if (isGestureCompleted()) {
             return;
         }
         switch (mTutorialType) {