Keep multi-component flag for old scene files
Keep multi-component flag for old scene files

This fixes the issue raised in T19919, where old scene files will crash
upon loading if one of the contained images is a multi-component image.
Solved by not clearing the property responsible for the image being
treated as multi-component.

RabadanLab/MITKats,iwegner/MITK,MITK/MITK,fmilano/mitk,RabadanLab/MITKats,fmilano/mitk,iwegner/MITK,iwegner/MITK,fmilano/mitk,RabadanLab/MITKats,RabadanLab/MITKats,iwegner/MITK,MITK/MITK,fmilano/mitk,iwegner/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,RabadanLab/MITKats,fmilano/mitk,fmilano/mitk,fmilano/mitk,RabadanLab/MITKats,iwegner/MITK