For ticket #667, warning about keyspace name in alter process has bee…

…n removed

The warning `The keyspace name can't be altered` has been removed; as the field is disabled already.

renderer/js/events/clusters.js

@@ -11925,7 +11925,7 @@
 
         $(this).attr('disabled', isAlterState ? '' : null)
         $(this).parent().toggleClass('invalid-warning', isAlterState)
-        $(this).toggleClass('is-invalid ignore-invalid', isAlterState)
+        $(this).removeClass('is-invalid ignore-invalid')
 
         try {
           if (!isAlterState)