[IMP] payment_redsys: Add the discount on the order summary
[IMP] payment_redsys: Add the discount on the order summary

The discount is shown on the order summary if the current user is a member of sale.group_discount_per_so_line group

syci/l10n-spain,JuanjoA/l10n-spain,diagramsoftware/l10n-spain,Endika/l10n-spain,markeTIC/l10n-spain,JuanjoA/l10n-spain,algiopensource/l10n-spain,agaldona/l10n-spain,Comunitea/l10n-spain,diagramsoftware/l10n-spain,Endika/l10n-spain,markeTIC/l10n-spain,syci/l10n-spain,RamonGuiuGou/l10n-spain,agaldona/l10n-spain,RamonGuiuGou/l10n-spain,algiopensource/l10n-spain,Comunitea/l10n-spain,Comunitea/l10n-spain