Correct ID3::StringSize calculation for UCS-2 data.

Album art was not displayed when albums were transferred via MediaGo
because the length of the description in the APIC tag was not
correctly calculated.

The method StringSize used to calculate the length of the tag
does not add the size of the null termination in UCS-2 case.

Change-Id: I5409d42f5e87d315e6e03c4d7e6cbd8a378a160d
1 file changed