Fixing AllAppsIconToHomeTest

It's flaky now since apparently a previous test leaves open context
menu.

This should help.

Test: AllAppsIconToHomeTest
Change-Id: Iaa723f43963f2bfb2be8d590225cf18a2eec3d13
diff --git a/tests/src/com/android/launcher3/ui/AllAppsIconToHomeTest.java b/tests/src/com/android/launcher3/ui/AllAppsIconToHomeTest.java
index 23560e8..a50a8b1 100644
--- a/tests/src/com/android/launcher3/ui/AllAppsIconToHomeTest.java
+++ b/tests/src/com/android/launcher3/ui/AllAppsIconToHomeTest.java
@@ -42,7 +42,8 @@
         LauncherActivityInfo settingsApp = getSettingsApp();
 
         clearHomescreen();
-        mActivityMonitor.startLauncher();
+        mDevice.pressHome();
+        mDevice.waitForIdle();
 
         // Open all apps and wait for load complete.
         final UiObject2 appsContainer = openAllApps();