[FIX] Wrong Indentation on block statements

- Error W0631: pylint descubir un mal uso de una variable, y esto es
debido a que hay un conjunto de sentencias que aparenta deben estar
dentro de un ciclo for pero no lo están.

  [5]  https://github.com/vauxoo-dev/odoo-venezuela/blob/7.0-pylint-kty/l10n_ve_fiscal_requirements/wizard/account_invoice_refund.py#L305-L325
  error: "l10n_ve_fiscal_requirements.wizard.account_invoice_refund:305:
[W0631(undefined-loop-variable),
account_invoice_refund.compute_refund] Using possibly undefined loop
variable 'inv'"