Fixed PropertyNameHelper test (uppercase-output)
Summary: Adds to D17: Had to change the property name helper test in order to follow the new DICOM uppercase character standard.
Test Plan: Unit test contained; was modified corresponding to the changes made to the module itself
Reviewers: floca, kislinsk, O1 MITK Core
Reviewed By: kislinsk, O1 MITK Core
Subscribers: kalali
Maniphest Tasks: T22064
Differential Revision: https://phabricator.mitk.org/D18