Nandroid menu fixes:
- fix memory overflow bug if vold managed volumes reach MAX_NUM_MANAGED_VOLUMES.
- easier editing: this completes previous two commits to clean up Install Zip menu and Advanced menu

Change-Id: I349cc7b04878b92d902e1ee826d9b4c5bc77cf83
(cherry picked from commit a88b701ccb0733ca5cdd51490b86707c8d19a1f4)