'Ensemble Classification Data' element stores the result in an incorrect folder

The "Ensemble Classification Data" element stores the result in the workflow output folder by default.
Do the following changes:

1. "Output file" attribute value should be empty by default.
2. "Output file" line edit should contain "Auto" placeholder, if the attribute value is empty.
3. The result file should be stored in "%workflow_output_folder%/run/ensemble.csv" if the attribute value is empty.