[clean] remove useless function and dependencies

models/scop_bordereau_cg.py

 # © 2021 Le Filament (<http://www.le-filament.com>)
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
-from odoo import fields, models, api, registry
+from odoo import fields, models, api
 from odoo.exceptions import UserError
 import logging
-import threading
 
 _logger = logging.getLogger(__name__)
 
@@ -217,13 +216,6 @@ class Bordereau(models.Model):
             else:
                 r.ca = r.va = r.net_results = r.wage_cg = 0
 
-    @api.multi
-    def _compute_name(self):
-        for bordereau in self:
-            bordereau.name = "Bordereau %s - %s" % (
-                bordereau.base_cotisation_cg.year,
-                bordereau.partner_id.name)
-
     @api.depends('invoice_ids.state',
                  'bordereau_version_ids', 'bordereau_version_ids.state')
     @api.multi