Fix the ftl script

src/bin/keycloakify/generateFtl/ftl_object_to_js_code_declaring_an_object.ftl

@@ -1,4 +1,5 @@
 <script>const _= 
+<#assign pageId="PAGE_ID_xIgLsPgGId9D8e">
 (()=>{
 
     const out = ${ftl_object_to_js_code_declaring_an_object(.data_model, [])?no_esc};
@@ -120,7 +121,7 @@
 
     out["keycloakifyVersion"] = "KEYCLOAKIFY_VERSION_xEdKd3xEdr";
     out["themeVersion"] = "KEYCLOAKIFY_THEME_VERSION_sIgKd3xEdr3dx";
-    out["pageId"] = "PAGE_ID_xIgLsPgGId9D8e";
+    out["pageId"] = "${pageId}";
 
     return out;