fix(create-accounts): set is_company_account=1 on auto-created Bank Accounts

Bank Accounts created via the "Create Bank Accounts" button represent
the user's own accounts at the bank — not counterparty accounts — so
they need is_company_account=1. Without it, ERPNext treats them as
external and they don't appear in Bank Reconciliation Tool or as
selectable paid_from/paid_to in Payment Entry / Journal Entry.

jey_erp/bank_integration/creation.py

@@ -249,6 +249,7 @@ def create_unmapped_accounts(bank_integration):
 			ba.iban = row.iban
 			ba.bank = default_bank
 			ba.company = default_company
+			ba.is_company_account = 1
 			ba.bank_integration_type = "Bank Statement Importer"
 			ba.bank_integration = bi.name
 			ba.insert(ignore_permissions=True)