Break out of disambiguation loop once disambig has been added

Instead of iterating over all the path parts and added disambiguation to
each, it now only adds the disambiguation to the first match.

whipper/common/program.py

@@ -250,6 +250,7 @@ class Program:
                         templateParts[i] += ' (%s)' % self.metadata.catalogNumber
                     elif self.metadata.barcode:
                         templateParts[i] += ' (%s)' % self.metadata.barcode
+                    break
             template = os.path.join(*templateParts)
             logger.debug('Disambiguated template to %r' % template)