Use overridden default xml for TwoPanelWorkspaceTest

- Partially reverted TAPL and TwoPanelWorkspaceTest changes on http://ag/19195512

Fix: 262627208
Fix: 262632384
Test: TwoPanelWorkspaceTest
Change-Id: I8b793bfb3874cc6305ce8b0f9f7b0a116d01222b
diff --git a/src/com/android/launcher3/LauncherSettings.java b/src/com/android/launcher3/LauncherSettings.java
index 4c8f2d9..932f98a 100644
--- a/src/com/android/launcher3/LauncherSettings.java
+++ b/src/com/android/launcher3/LauncherSettings.java
@@ -377,6 +377,8 @@
 
         public static final String METHOD_SET_USE_TEST_WORKSPACE_LAYOUT_FLAG =
                 "set_use_test_workspace_layout_flag";
+        public static final String ARG_DEFAULT_WORKSPACE_LAYOUT_TEST = "default_test_workspace";
+        public static final String ARG_DEFAULT_WORKSPACE_LAYOUT_TEST2 = "default_test2_workspace";
 
         public static final String METHOD_CLEAR_USE_TEST_WORKSPACE_LAYOUT_FLAG =
                 "clear_use_test_workspace_layout_flag";