Clear separation of RootList Context Menu items and DirList items.

Change-Id: I7f83b21a499de67f628b1fe0cf1582fe70f86c4d
diff --git a/res/menu/root_context_menu.xml b/res/menu/root_context_menu.xml
index a0cd150..1ff818b 100644
--- a/res/menu/root_context_menu.xml
+++ b/res/menu/root_context_menu.xml
@@ -16,15 +16,15 @@
 
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
     <item
-        android:id="@+id/menu_eject_root"
+        android:id="@+id/root_menu_eject_root"
         android:title="@string/menu_eject_root" />
     <item
-        android:id="@+id/menu_open_in_new_window"
+        android:id="@+id/root_menu_open_in_new_window"
         android:title="@string/menu_open_in_new_window" />
     <item
-        android:id="@+id/menu_paste_into_folder"
+        android:id="@+id/root_menu_paste_into_folder"
         android:title="@string/menu_paste_into_folder" />
     <item
-        android:id="@+id/menu_settings"
+        android:id="@+id/root_menu_settings"
         android:title="@string/menu_settings" />
 </menu>