[FIX] sale: portal: automatically open the popup for payment

Before this commit, the popup for payment wasn't open after signature.

This is because Bootstrap no longer uses jQuery and jQuery .trigger
only calls jQuery handlers.

See 'o_sale_portal_paynow' button with data-bs attributes on it.

closes odoo/odoo#98290

Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>

addons/sale/static/src/js/sale_portal_sidebar.js

@@ -26,7 +26,7 @@ publicWidget.registry.SalePortalSidebar = PortalSidebar.extend({
         this._generateMenu();
         // After signature, automatically open the popup for payment
         if ($.bbq.getState('allow_payment') === 'yes' && this.$('#o_sale_portal_paynow').length) {
-            this.$('#o_sale_portal_paynow').trigger('click');
+            this.el.querySelector('#o_sale_portal_paynow').click();
             $.bbq.removeState('allow_payment');
         }
         return def;