round issue when precision digits=0

[Ivan Yelizariev]

Steps to reproduce:
* install v8
* install sale module
* create quotation
* set rights to discount per line
* set discount = 10 for some line
* set digits=0 at decimal precision for Discount
* print report for quotation

you will see Disc.(%) 1 instead Disc.(%) 10

But If I set discount = 12, then at report I get Disc.(%) 12

[Ivan Yelizariev (yelizariev)]

I should to note, that at backend (quotation view) there is correct value for discount

[Ivan Yelizariev (yelizariev)]

Also, there is a solution to show only integer part at qweb report:
* set none zero value for digits at decimal precision for Discount
* use formatLang at report
<span t-esc="formatLang(l.discount, digits=0)"/>