[12.0][FIX]l10n_it_sdi_channel: restore python 3.5 compatibility

l10n_it_sdi_channel/models/sdi.py

@@ -59,12 +59,7 @@ def send(self, attachment_out_ids):
         return send_method(attachment_out_ids)
 
     @api.model
-    def _prepare_attachment_in_values(
-        self,
-        file_name,
-        file_content,
-        **default_values,
-    ):
+    def _prepare_attachment_in_values(self, file_name, file_content, **default_values):
         """
         Get values to create an Electronic Bill (`fatturapa.attachment.in`).
 
@@ -98,12 +93,7 @@ def _prepare_attachment_in_values(
         return attachment_values
 
     @api.model
-    def _process_single_fe(
-        self,
-        file_name,
-        file_content,
-        **default_values,
-    ):
+    def _process_single_fe(self, file_name, file_content, **default_values):
         """
         Extract values from SdI file to create Electronic Bill(s).
 
@@ -139,12 +129,7 @@ def _process_single_fe(
         return attachments_values
 
     @api.model
-    def receive_fe(
-        self,
-        file_name_content_dict,
-        metadata_file_name_content_dict,
-        **default_values,
-    ):
+    def receive_fe(self, file_name_content_dict, metadata_file_name_content_dict, **default_values):
         """
         Save Electronic Bills received from SdI.