[FIX] account,purchase,sale: wrong mail thread method signature

Since 3eb9680, the signature of method
`_notify_by_email_prepare_rendering_context` has been changed to provide
a default values to `msg_vals` and some overrides were not adapted
(or have been added afterwards).

No true bug/issue has been found caused by that discrepancy, but for
consistency, this commit makes sure those overrides are adapted to
provide the same API as the parent method.

Fixes #162742

closes #163334

Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

addons/account/models/account_move.py

@@ -4382,7 +4382,7 @@ def _creation_message(self):
             'in_receipt': _('Purchase Receipt Created'),
         }[self.move_type]
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         # EXTENDS mail mail.thread
         render_context = super()._notify_by_email_prepare_rendering_context(

addons/purchase/models/purchase.py

@@ -386,7 +386,7 @@ def _notify_get_recipients_groups(self, msg_vals=None):
 
         return groups
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         render_context = super()._notify_by_email_prepare_rendering_context(
             message, msg_vals, model_description=model_description,

addons/sale/models/sale_order.py

@@ -1275,7 +1275,7 @@ def _notify_get_recipients_groups(self, msg_vals=None):
 
         return groups
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         render_context = super()._notify_by_email_prepare_rendering_context(
             message, msg_vals, model_description=model_description,