Use strings "home" and "overview" rather than GEL

Bug:129421797
Test: Flashed to QP1A.190508.001, installed launcher with change.
      Observed both home and overview predictions were as expected.

Change-Id: I127d489eae382f4cee75afdd6d615d6d7a8227ee
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
index 48a163d..6dad9af 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/appprediction/PredictionUiStateManager.java
@@ -67,8 +67,8 @@
 
     // TODO (b/129421797): Update the client constants
     public enum Client {
-        HOME("GEL"),
-        OVERVIEW("OVERVIEW_GEL");
+        HOME("home"),
+        OVERVIEW("overview");
 
         public final String id;