Fix for float / double level and window values

Summary: Since itk changed the enum types (component type), the check for float and double values had to be changed as well.

Test Plan: -

Reviewers: MITK Reviewer Group I, O1 MITK Core, kislinsk

Reviewed By: MITK Reviewer Group I, O1 MITK Core, kislinsk

Maniphest Tasks: T26649

Differential Revision: https://phabricator.mitk.org/D213