[FIX] l10n_it_withholding_tax: compare amount with float_compare
[FIX] l10n_it_withholding_tax: compare amount with float_compare

OCA/l10n-italy,OCA/l10n-italy,OCA/l10n-italy,dcorio/l10n-italy,dcorio/l10n-italy,dcorio/l10n-italy