Reduce number of labels in test label set
Reduce number of labels in test label set

Remove testing of adding 65535 labels as it is extremely time consuming
with the current std::map-based mitk::LabelSet type.

MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK