reverted changes in base.py to upstream

tools/sigma/backends/base.py

@@ -65,7 +65,7 @@ class BackendOptions(dict):
     def _load_config_file(self, path):
         """
         Populates options from a configuration file
-        
+
         :param path: Path to the configuration file
         """
         if path is None:
@@ -337,4 +337,4 @@ class SingleTextQueryBackend(RulenameCommentMixin, BaseBackend, QuoteCharMixin):
         in addition to the field mapping defined in the conversion configuration. The field name passed to this method was already
         transformed from the original name given in the Sigma rule.
         """
-        return fieldname
+        return fieldname