Temporarily going home from an app via device.pressHome

The gesture will be restored once we have a UI automation-stable
gesture detection on the Launcher side.

Change-Id: I94cd52b61cd65961ac471d0e4ae0db1fc766a66b
diff --git a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
index b71f790..00257a5 100644
--- a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
+++ b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
@@ -347,12 +347,7 @@
                 log(action = "0-button: from another app");
                 assertTrue("Launcher is visible, don't know how to go home",
                         !mDevice.hasObject(By.pkg(getLauncherPackageName())));
-                final UiObject2 navBar = waitForSystemUiObject("navigation_bar_frame");
-
-                swipe(
-                        navBar.getVisibleBounds().centerX(), navBar.getVisibleBounds().centerY(),
-                        navBar.getVisibleBounds().centerX(), 0,
-                        BACKGROUND_APP_STATE_ORDINAL, ZERO_BUTTON_STEPS_FROM_BACKGROUND_TO_HOME);
+                mDevice.pressHome();
             }
         } else {
             log(action = "clicking home button");