Make isTooltipEnabled a getter due to its mutable dependencies.

IS_RUNNING_IN_TEST_HARNESS is mutable and can change during the
lifecycle of launcher.

Test: Manual
Fix: 271160958
Change-Id: Ib033e0684d99e784185e1da1e52632411f6c096b
diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarEduTooltipController.kt b/quickstep/src/com/android/launcher3/taskbar/TaskbarEduTooltipController.kt
index 00dfaf2..2dd8bcb 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarEduTooltipController.kt
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarEduTooltipController.kt
@@ -56,7 +56,8 @@
 class TaskbarEduTooltipController(val activityContext: TaskbarActivityContext) :
     LoggableTaskbarController {
 
-    private val isTooltipEnabled = !IS_RUNNING_IN_TEST_HARNESS && ENABLE_TASKBAR_EDU_TOOLTIP.get()
+    private val isTooltipEnabled: Boolean
+        get() = !IS_RUNNING_IN_TEST_HARNESS && ENABLE_TASKBAR_EDU_TOOLTIP.get()
     private val isOpen: Boolean
         get() = tooltip?.isOpen ?: false