[account_mtd_vat] Warnings about unknown fields in vat_detailed_submission_logs

[Nick-OpusVL]

Do a VAT submission that actually has VAT in it, look at logs:

2019-06-20 11:43:02,743 1 WARNING mtd-vat openerp.models: mtd_vat.vat_detailed_submission_logs.create() with unknown fields: amount_residual, amount_residual_currency, analytic_lines, balance, invoice, mtd_tax_amount, narration, vat, vat_submission_id
2019-06-20 11:43:02,746 1 WARNING mtd-vat openerp.models: mtd_vat.vat_detailed_submission_logs.create() with unknown fields: amount_residual, amount_residual_currency, analytic_lines, balance, invoice, mtd_tax_amount, narration, vat, vat_submission_id

Found in 8.0, possibly in all