docs: update "create with presets" example

Author: yaroslav8765

adminforth/documentation/docs/tutorial/03-Customization/13-standardPagesTuning.md

@@ -555,7 +555,7 @@ Sometimes you might need to create a link that will open the create form with so
         resourceId: 'aparts',
       },
       query: {
-        values: (JSON.stringify({
+        values: atob_function(JSON.stringify({
           realtor_id: coreStore?.adminUser.dbUser.id 
         })),
       },
@@ -569,6 +569,7 @@ Sometimes you might need to create a link that will open the create form with so
 <script setup lang="ts">
 import { LinkButton } from '@afcl';
 import { useCoreStore } from '@/stores/core';
+import { btoa_function } from '@/utils';
 
 const coreStore = useCoreStore();
 </script>