[FIX] account: properly link bank account created via setup wizard with existing journals when choosing to do so

[IMP] account_bank_statement_import: bank account manual configuration wizard: when linking to an existing journal, change its statements source if the journal had an 'undefined' source.

addons/account/wizard/setup_wizards.py

@@ -100,6 +100,8 @@ class SetupBarBankConfigWizard(models.TransientModel):
                     'company_id': company.id,
                     'bank_account_id': record.res_partner_bank_id.id,
                 })
+            else:
+                selected_journal.bank_account_id = record.res_partner_bank_id.id
 
     def validate(self):
         """ Called by the validation button of this wizard. Serves as an

addons/account_bank_statement_import/wizard/setup_wizards.py

@@ -10,5 +10,5 @@ class SetupBarBankConfigWizard(models.TransientModel):
         """ Default the bank statement source of new bank journals as 'file_import'
         """
         super(SetupBarBankConfigWizard, self).validate()
-        if self.create_or_link_option == 'new':
+        if self.create_or_link_option == 'new' or self.linked_journal_id.bank_statements_source == 'undefined':
             self.linked_journal_id.bank_statements_source = 'file_import'