[CHORE] Comment variable that isn't used

lib/page/filter_fasilitas/update_kegiatan.dart

@@ -19,7 +19,7 @@ class UpdateKegiatan extends StatefulWidget {
 }
 
 class _UpdateKegiatanState extends State<UpdateKegiatan> {
-  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
+  // final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
 
   TextEditingController namaKegiatanController = TextEditingController();
   TextEditingController penyelenggaraController = TextEditingController();