Follow up f803b4af - Fixes #5324 - Values can be changed via keyboard tabbing when the field is read-only.

Co-authored-by: Dusan Vuckovic <dv@zammad.com>

app/assets/stylesheets/zammad.scss

@@ -2073,7 +2073,7 @@ fieldset > .form-group {
     pointer-events: none;
     cursor: not-allowed !important;
 
-    input:read-only.form-control:not(.js-input) {
+    input:read-only.form-control:not(.js-input, .js-objectSelect) {
       pointer-events: auto;
       cursor: auto;
     }