BUG: Fix label_channel selection bug
BUG: Fix label_channel selection bug

When Label_channel column is present in the CSV input, it needs to be parsed as an int.
However, due to a bug, the value for label was used instead.

Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics