[AppleDevice] Fix consistency of URIs (BGO#620826)

After the track has been committed to the AppleDevice, the URI
on Banshee should be updated so:
- The user can click on "Open containing folder" and get the correct
result.
- The SaveTrackMetadataJob can act on the device if the user needs
to update the metadata (this will be enabled when patches for
BGO#589196) land.
Patch by Andrés G. Aragoneses