Checking can start system gesture before creation of TaskbarStashInputConsumer, so that taskbar does not show up when user performs swipe up from lock screen or notification panel.

Test: visual(video in buganizer)

Fix:261524189, 262589756

Change-Id: I5252281025953753f9184f1b19c534513b5800fa

quickstep/src/com/android/quickstep/TouchInteractionService.java

@@ -800,7 +800,7 @@ public class TouchInteractionService extends Service
 
             // If Taskbar is present, we listen for long press to unstash it.
             TaskbarActivityContext tac = mTaskbarManager.getCurrentActivityContext();
-            if (tac != null) {
+            if (tac != null && canStartSystemGesture) {
                 reasonString.append(NEWLINE_PREFIX)
                         .append(reasonPrefix)
                         .append(SUBSTRING_PREFIX)