[10.0][MIG] Remove useless code, field invoiced_rate has been dropped since 9.0.
[10.0][MIG] Remove useless code, field invoiced_rate has been dropped since 9.0.

OCA/l10n-brazil,OCA/l10n-brazil,akretion/l10n-brazil,akretion/l10n-brazil,akretion/l10n-brazil,OCA/l10n-brazil