[FIX] account: Partner on move created from statement line

Steps to reproduce the bug:

- Let's consider a customer C
- Create a customer invoice I for C for 100€ and reference R
- Create a bank statement with a line L for C and the reference R
- Reconcile I and L and go in the jouranl entries

Bug:

The account move created for the reconciliation had no partner set.

opw:2200679

closes odoo/odoo#46332

X-original-commit: c454b661668a54240ff32ede78f0ad963e3fcd25
Signed-off-by: Simon Goffin (sig) <sig@openerp.com>

addons/account/models/account_bank_statement.py

@@ -596,6 +596,7 @@ class AccountBankStatementLine(models.Model):
             'journal_id': self.statement_id.journal_id.id,
             'currency_id': self.statement_id.currency_id.id,
             'date': self.statement_id.accounting_date or self.date,
+            'partner_id': self.partner_id.id,
             'ref': ref,
         }
         if self.move_name: