Simplifying switching to home for some tests

Change-Id: I696d0267a2c36a18080396657bed07f7b1654a7d

tests/src/com/android/launcher3/ui/widget/AddConfigWidgetTest.java

@@ -98,7 +98,7 @@ public class AddConfigWidgetTest extends AbstractLauncherUiTest {
         lockRotation(true);
 
         clearHomescreen();
-        mActivityMonitor.startLauncher();
+        mDevice.pressHome();
 
         final Widgets widgets = mLauncher.getWorkspace().openAllWidgets();