Remove long-noisily deprecated if clause

CRM/Contact/BAO/Contact.php

@@ -129,15 +129,6 @@ class CRM_Contact_BAO_Contact extends CRM_Contact_DAO_Contact implements Civi\Co
       }
     }
 
-    if (isset($params['preferred_communication_method']) && is_array($params['preferred_communication_method'])) {
-      if (!empty($params['preferred_communication_method']) && empty($params['preferred_communication_method'][0])) {
-        CRM_Core_Error::deprecatedWarning(' Form layer formatting should never get to the BAO');
-        CRM_Utils_Array::formatArrayKeys($params['preferred_communication_method']);
-        $contact->preferred_communication_method = CRM_Utils_Array::implodePadded($params['preferred_communication_method']);
-        unset($params['preferred_communication_method']);
-      }
-    }
-
     $defaults = ['source' => $params['contact_source'] ?? NULL];
     if ($params['contact_type'] === 'Organization' && isset($params['organization_name'])) {
       $defaults['display_name'] = $params['organization_name'];