fix typo issue

hyrax/app/models/bulkrax/crc_folder_complex_modality_entry.rb

@@ -36,7 +36,7 @@ module Bulkrax
       siblings = parent.complex_modalities
       modality_title = sanitize_title(self.raw_metadata['title'])
      
-      modality_title = session_title.rjust(3, '0')  if modality_title.length < 3 
+      modality_title = modality_title.rjust(3, '0')  if modality_title.length < 3 
 
       suffix = 1
       new_title = modality_title