Fix check_unflagged_fraction crash when using toil (RAP-128)

The step check_unflagged_fraction is not properly running with toil. The aim of this MR is to fix this bug.

Ticket: RAP-128

steps/check_unflagged_fraction.cwl

@@ -53,7 +53,6 @@ requirements:
           if 'listing' in inputs['msin'].keys():
              del inputs['msin']['listing']
           if flagged != 'None':
-             print(inputs['msin'])
              cwl_output['msout']            = [inputs['msin']]
              cwl_output['msout'][0]['path'] = output['filename']
              cwl_output['filename']         = 'None'