[FIX] point_of_sale: allow closing control for pos user

The closing control of a POS session doesn't work if the user doesn't
have invoicing rights

Steps to reproduce:
1. Install Point of Sale
2. Go to Settings > Users and open Marc Demo
3. Remove Marc Demo rights on Invoicing
4. Connect as Marc Demo
5. Open a session in any POS
6. Do the opening control and then the closing control of the session
   (with a difference)
7. An error is raised

Solution:
Post the difference during closing control using sudo

Problem:
When posting a difference in the closing control, the user didn't have
enough rights to post the statement

opw-3116907

closes odoo/odoo#109684

X-original-commit: 3225fdcaaf20da0aa54db4161cee4cb9b48506ee
Signed-off-by: Trinh Jacky (trj) <trj@odoo.com>
Signed-off-by: Guillaume Merlin (megu) <megu@odoo.com>

addons/point_of_sale/models/pos_session.py

@@ -316,7 +316,7 @@ class PosSession(models.Model):
                 self.env.cr.rollback()
                 return self._close_session_action(balance)
 
-            self._post_statement_difference(cash_difference_before_statements)
+            self.sudo()._post_statement_difference(cash_difference_before_statements)
             if self.move_id.line_ids:
                 self.move_id.sudo().with_company(self.company_id)._post()
                 # Set the uninvoiced orders' state to 'done'
@@ -325,7 +325,7 @@ class PosSession(models.Model):
                 self.move_id.sudo().unlink()
             self.sudo().with_company(self.company_id)._reconcile_account_move_lines(data)
         else:
-            self._post_statement_difference(self.cash_register_difference)
+            self.sudo()._post_statement_difference(self.cash_register_difference)
 
         self.write({'state': 'closed'})
         return True
@@ -1479,7 +1479,7 @@ class PosSession(models.Model):
         self.opening_notes = notes
         difference = cashbox_value - self.cash_register_balance_start
         self.cash_register_balance_start = cashbox_value
-        self._post_statement_difference(difference)
+        self.sudo()._post_statement_difference(difference)
         self._post_cash_details_message('Opening', difference, notes)
 
     def _post_cash_details_message(self, state, difference, notes):