Change accessibility announcement for workspace from "Pixel Launcher" to "Home".

Bug: 228410736
Test: Verified correct talkback announcements.
Change-Id: Ic0a5295cde3cd23d2fc5a6fcd19b6cf8e0f3e386
(cherry picked from commit 83bc5f50506c2733991f70368a264c4a3d23d0c1)
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 31c1eff..1846383 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -536,6 +536,7 @@
         if (Utilities.ATLEAST_R) {
             getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_ADJUST_NOTHING);
         }
+        setTitle(R.string.home_screen);
     }
 
     protected LauncherOverlayManager getDefaultOverlay() {