[fix] Mobile no search issue in the pos (#12090)

erpnext/selling/page/point_of_sale/point_of_sale.js

@@ -674,6 +674,11 @@ class POSCart {
 				fieldname: 'customer',
 				options: 'Customer',
 				reqd: 1,
+				get_query: function() {
+					return {
+						query: 'erpnext.controllers.queries.customer_query'
+					}
+				},
 				onchange: () => {
 					this.events.on_customer_change(this.customer_field.get_value());
 				}