omni: change ThemePicker shape preview overlay

Change-Id: I058c7a46442cc3b0aaf2d22a5cffbf406e202d70
diff --git a/overlay/common/packages/apps/ThemePicker/res/values/override.xml b/overlay/common/packages/apps/ThemePicker/res/values/override.xml
index b125016..f99b153 100644
--- a/overlay/common/packages/apps/ThemePicker/res/values/override.xml
+++ b/overlay/common/packages/apps/ThemePicker/res/values/override.xml
@@ -21,7 +21,7 @@
     <!-- List of packages whose icons are used to preview the icon shape for a theme. -->
     <array name="icon_shape_preview_packages">
         <item>com.android.settings</item>
-        <item>com.android.launcher3</item>
+        <item>com.android.messaging</item>
         <item>com.android.dialer</item>
         <item>com.android.contacts</item>
     </array>