More Client Enforcement in modals across the app

agent/modals/asset/asset_link_document.php

@@ -13,7 +13,8 @@ $row = mysqli_fetch_assoc($sql);
 $asset_name = escapeHtml($row['asset_name']);
 $client_id = intval($row['asset_client_id']);
 
-// Generate the HTML form content using output buffering.
+enforceClientAccess();
+
 ob_start();
 
 ?>
@@ -67,4 +68,5 @@ ob_start();
 </form>
 
 <?php
+
 require_once '../../../includes/modal_footer.php';