[FIX] point_of_sale: load disabled uoms

this is needed when selling products with a disabled uom

addons/point_of_sale/static/src/js/models.js

@@ -151,6 +151,7 @@ function openerp_pos_models(instance, module){ //module is instance.point_of_sal
             model:  'product.uom',
             fields: [],
             domain: null,
+            context: function(self){ return { active_test: false }; },
             loaded: function(self,units){
                 self.units = units;
                 var units_by_id = {};