fix: removing unused configuration

Author: DSuveges

config/step/gwas_catalog.yaml

@@ -1,6 +1,5 @@
 _target_: otg.gwas_catalog.GWASCatalogStep
 catalog_study_files: ${datasets.catalog_studies}
-catalog_unpublished_studies_file: ${datasets.catalog_unpublished_studies}
 catalog_ancestry_file: ${datasets.catalog_ancestries}
 catalog_associations_file: ${datasets.catalog_associations}
 catalog_sumstats_lut: ${datasets.catalog_sumstats_lut}