Update pos_payment_terminal.js (ticket #3304)

extra_addons/pos_payment_terminal/static/src/js/pos_payment_terminal.js

@@ -107,7 +107,7 @@ odoo.define('pos_payment_terminal.pos_payment_terminal', function (require) {
             this._super.apply(this, arguments);
             var line = this.pos.get_order().selected_paymentline;
             var auto = line.get_automatic_payment_terminal();
-            $('.back').hide();
+            //$('.back').hide();
             if (auto) {
                 this.pos.proxy.payment_terminal_transaction_start(self, self.pos.currency.name);
             }