Update the ref to vtkDICOM remote module
Remove usage of the no-longer-existing VTK_IN_VTK
definition.
This change is needed or vtkDICOM/Testing will not build.
Backport: release
Remove usage of the no-longer-existing VTK_IN_VTK
definition.
This change is needed or vtkDICOM/Testing will not build.
Backport: release