fix python lint

Author: duck2

vtr_flow/scripts/python_libs/vtr/util.py

@@ -459,9 +459,10 @@ def argparse_use_previous(inp: str) -> List[Tuple[str, List]]:
         if not r:
             raise argparse.ArgumentError(None, "Invalid input to -use_previous: %s" % w)
         if not REUSABLE_FILES.get(r.group(2)):
-            raise argparse.ArgumentError(None,
+            raise argparse.ArgumentError(
+                None,
                 "Unknown file type to use_previous: %s, available types: %s"
-                % (r.group(2), ",".join(REUSABLE_FILES.keys()))
+                % (r.group(2), ",".join(REUSABLE_FILES.keys())),
             )
         out.append((r.group(1), REUSABLE_FILES[r.group(2)]))