[FIX] point_of_sale: recompute for current session only

The previous trigger would recompute all sessions of a config when modifying
the cash_control flag on the config.
It was not possible to enable cash_control if a previous session wasn't in
cash control mode.

Recompute only when changing the config.

addons/point_of_sale/models/pos_session.py

@@ -112,7 +112,7 @@ class PosSession(models.Model):
         action['domain'] = [('id', 'in', pickings.ids)]
         return action
 
-    @api.depends('config_id.cash_control')
+    @api.depends('config_id', 'statement_ids')
     def _compute_cash_all(self):
         for session in self:
             session.cash_journal_id = session.cash_register_id = session.cash_control = False