[FIX] sale_stock_ux: reserved quantity widget
[FIX] sale_stock_ux: reserved quantity widget

closes ingadhoc/sale#571

X-original-commit: cccb29871b617cd98625045748203ebbd450fbfd
Signed-off-by: Nicolas Mac Rouillon <8d34fe7b7c65100e706828a8c0d03426900ffb59@adhoc.com.ar>

ingadhoc/sale,ingadhoc/sale,ingadhoc/sale,ingadhoc/sale