BUG: Fixed extra spaces in names of DICOM volumes

Spaces were added after each character of the name of a volume that was loaded from DICOM. This has now been fixed by encoding to Latin-1 (which conversion is used throughout the code).

Fixes #3688

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23536 3bd1e089-480b-0410-8dfb-8563597acbee