Fix move's amount_secound_currency with negative taxes.

issue3683
review4721002
(grafted from 97a199d6ffc6024d8a7826139da0b8b2c8cbb48c)

--HG--
branch : 3.0
extra : source : 97a199d6ffc6024d8a7826139da0b8b2c8cbb48c