Ensure self.directory is updated at each call to validate

hepdata_validator/full_submission_validator.py

@@ -43,6 +43,7 @@ def validate(self, directory=None, file=None, zipfile=None):
         """
         self.single_yaml_file = False
         temp_directory = None
+        self.directory = directory
 
         try:
             # Check input file/directory exists and is valid