remove hardcoded iframe source and set to null for future implementation

Author: eiresendez

resources/views/tasks/partials/hitl-iframe.blade.php

@@ -1,8 +1,7 @@
 {{-- Smart Extract Manual Edit content when HITL is enabled --}}
 @php
   // Note: This URL will be obtained from request data in future implementation.
-  $iframeSrc =
-      'https://assets.processmaker.net/tces/edit.html?documentToken=6519c0f184aa123baaee296111e5247c&fileId=nOh7qKiHnLL3786w3N3QUu1u7RI3p_6b02cbd0-7551-446b-9b57-5cb931037845';
+  $iframeSrc = null;
 @endphp
 
 @if (!empty($iframeSrc))