Fix: wrong dividend valuation during database upgrade from v12 to v13
Fix: wrong dividend valuation during database upgrade from v12 to v13

blaurent49/duniter,blaurent49/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,blaurent49/duniter,duniter/duniter,duniter/duniter,duniter/duniter,duniter/duniter