overlay: Show DocumentsUI internal storage by default

Change-Id: I1ada4009c5f71681761d1fb033d3d1c8609b7797

overlay/common/packages/apps/DocumentsUI/res/values/config.xml

@@ -20,5 +20,8 @@
              as Files app. Including showing of the Documents and "advanced" roots. -->
     <bool name="show_documents_root">true</bool>
 
+    <!-- Indicates if internal storage is shown as default or not. -->
+    <bool name="config_default_show_device_root">true</bool>
+
     <string name="default_root_uri" translatable="false">content://com.android.externalstorage.documents/root/primary</string>
 </resources>