fixed issue with migration to threadpool executor

mutation_scan_ddg/ddg_mutation_scan.py

@@ -215,7 +215,7 @@ Configure the chains, mutant residue, and Rosetta options in the specified confi
         executor = concurrent.futures.ThreadPoolExecutor(
             max_workers=min(max_cpus, os.cpu_count())
         )
-        results = {executor.submit(run_flex_ddg, args=args): args for args in flex_ddg_cases}
+        results = {executor.submit(run_flex_ddg, *args): args for args in flex_ddg_cases}
         executor.shutdown(wait=True)
         # This will raise any of the exceptions thrown by the processes in pool so that we can see them
         for future in concurrent.futures.as_completed(results):