Fix TaplTestQuickStep.testOverview for large screen cuttlefish

- Use gesture (or button) to press home instead of UIDevice in the test, as UIDevice is sometimes failing to go home in cuttlefish

Bug: 193440212
Test: TaplTestQuickStep.testOverview
Change-Id: I834f1c93c24db24edbccd0bbf0ed5cfcf39a9b4d
diff --git a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
index 9a6eda4..c14a590 100644
--- a/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
+++ b/quickstep/tests/src/com/android/quickstep/TaplTestsQuickstep.java
@@ -145,12 +145,8 @@
                 launcher -> assertEquals("Dismissing a task didn't remove 1 task from Overview",
                         numTasks - 1, getTaskCount(launcher)));
 
-        // Test UIDevice.pressHome, once we are in AllApps.
-        mDevice.pressHome();
-        waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
-
         // Test dismissing all tasks.
-        mLauncher.getWorkspace().switchToOverview().dismissAllTasks();
+        mLauncher.pressHome().switchToOverview().dismissAllTasks();
         waitForState("Launcher internal state didn't switch to Home", () -> LauncherState.NORMAL);
         executeOnLauncher(
                 launcher -> assertEquals("Still have tasks after dismissing all",