Round tax rate to 2 digits in account_es_sii
As described [here](https://www.agenciatributaria.es/static_files/AEAT/Contenidos_Comunes/La_Agencia_Tributaria/Modelos_y_formularios/Suministro_inmediato_informacion/FicherosSuministros/V_1_1/SII_Descripcion_ServicioWeb_v1.1.pdf) the field TipoImpositivo must be Decimal(3,2). When you use taxes created by "account_es" there is no problem but if you create a tax manually (or edit the rate of an existing one) the rate field is filled with more digits and the SII message is rejected.
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