[FIX] mail_tracking: Changed injection method for 'failed_message_ids' field

Before this commit, some methods with views crashes trying to
process 'failed_message_ids' field.
After this commit the 'failed_message_ids' field description
is properly generated.

mail_tracking/__manifest__.py

@@ -5,7 +5,7 @@
 {
     "name": "Email tracking",
     "summary": "Email tracking system for all mails sent",
-    "version": "11.0.3.2.0",
+    "version": "11.0.3.2.1",
     "category": "Social Network",
     "website": "http://github.com/OCA/social",
     "author": "Tecnativa, "

mail_tracking/models/mail_thread.py

@@ -73,14 +73,14 @@ class MailThread(models.AbstractModel):
         return res
 
     @api.model
-    def fields_view_get(self, view_id=None, view_type='form', toolbar=False,
-                        submenu=False):
+    def _fields_view_get(self, view_id=None, view_type='form', toolbar=False,
+                         submenu=False):
         """Add filters for failed messages.
 
         These filters will show up on any form or search views of any
         model inheriting from ``mail.thread``.
         """
-        res = super().fields_view_get(
+        res = super()._fields_view_get(
             view_id=view_id, view_type=view_type, toolbar=toolbar,
             submenu=submenu)
         if view_type not in {'search', 'form'}: