check pin login

lib/domain/entities/user.dart

@@ -133,7 +133,7 @@ class User {
   }
 
   bool isCustomer() {
-    return privileges.length == 0;
+    return privileges.isEmpty;
   }
 
   bool hasSysAdmin() {
@@ -188,6 +188,10 @@ class User {
     return hasSysAdmin() || hasAdmin() || _has(privilege_carton);
   }
 
+  bool hasPinLogin() {
+    return _has(privilege_pin);
+  }
+
   bool _has(String privilege) {
     return (privileges.contains(privilege));
   }