add missing output_dir kwarg to vaspinputset.write_input

Author: esoteric-ephemera

pymatgen/io/vasp/sets/base.py

@@ -362,7 +362,7 @@ def write_input(
             cif_name = f"{output_dir}/{struct.formula.replace(' ', '')}.cif"
 
         vasp_input.write_input(
-            output_dir,
+            output_dir=output_dir,
             make_dir_if_not_present=make_dir_if_not_present,
             cif_name=cif_name,
             zip_name=f"{type(self).__name__}.zip" if zip_output else None,