[FIX] point_of_sale: load pos without tax

It was impossible to load the POS when no tax were existing because the
promise is resolved in the each loop instead of after. So we've moved it
after the loop which is its correct place.

closes odoo/odoo#37898

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

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

@@ -248,8 +248,8 @@ exports.PosModel = Backbone.Model.extend({
               }).then(function (taxes) {
                   _.each(taxes, function (tax) {
                       self.taxes_by_id[tax.id].amount = tax.amount;
-                  resolve();
                   });
+                  resolve();
               });
             });
         },