Using a standard way to go to Overview in DWB Toast test

Standardizing reduces maintenance.

Bug: 313926097
Flag: N/A
Test: presubmit
Change-Id: I0f59262a9f34c29a97c496f0f61c44ab1af56d04

quickstep/tests/src/com/android/quickstep/TaplDigitalWellBeingToastTest.java

@@ -17,8 +17,6 @@ package com.android.quickstep;
 
 import static androidx.test.InstrumentationRegistry.getInstrumentation;
 
-import static com.android.launcher3.LauncherState.OVERVIEW;
-
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -84,8 +82,7 @@ public class TaplDigitalWellBeingToastTest extends AbstractQuickStepTest {
     }
 
     private DigitalWellBeingToast getToast() {
-        executeOnLauncher(launcher -> launcher.getStateManager().goToState(OVERVIEW));
-        waitForState("Launcher internal state didn't switch to Overview", () -> OVERVIEW);
+        mLauncher.getWorkspace().switchToOverview();
         final TaskView task = getOnceNotNull("No latest task", launcher -> getLatestTask(launcher));
 
         return getFromLauncher(launcher -> {