Actually give raw folders a name.

Change-Id: I739b9fb5e95622b07eb7e0fd119d3a2aa1e3eddb
diff --git a/src/com/android/mail/providers/UIProvider.java b/src/com/android/mail/providers/UIProvider.java
index 211f458..23bbb00 100644
--- a/src/com/android/mail/providers/UIProvider.java
+++ b/src/com/android/mail/providers/UIProvider.java
@@ -629,7 +629,7 @@
          * folders should be only those that the provider wants to have
          * displayed.
          */
-        public static final String RAW_FOLDERS = null;
+        public static final String RAW_FOLDERS = "rawFolders";
         private ConversationColumns() {
         }
     }