Drop the nested form now twui guards a missing one

twui 0.1.5 makes Form's change handler tolerate a field with no form
ancestor, so the modal's own form is no longer needed to keep a change in
it from throwing.

src/pages/admin/settings/models/(partials)/harness-parameter-modal.tsx

@@ -1,6 +1,5 @@
 import { useState } from "react";
 import Modal from "@moduletrace/twui/elements/Modal";
-import Form from "@moduletrace/twui/form/Form";
 import H2 from "@moduletrace/twui/layout/H2";
 import Span from "@moduletrace/twui/layout/Span";
 import Stack from "@moduletrace/twui/layout/Stack";
@@ -102,12 +101,7 @@ export default function HarnessParameterModal({
                     and repeatable.
                 </Span>
             </Stack>
-            {/*
-              A form of its own: twui's Form reads the closest form on change,
-              so inside the page's form (this renders in a portal) a change
-              here would blow up reading the modal's wrapper.
-            */}
-            <Form className="w-full gap-4! items-stretch" onSubmit={(e) => e.preventDefault()}>
+            <Stack className="w-full gap-4! items-stretch">
                 <HarnessParameterFields
                     id={id}
                     harness={harness}
@@ -115,7 +109,7 @@ export default function HarnessParameterModal({
                     params={params}
                     onChange={onChange}
                 />
-            </Form>
+            </Stack>
         </Modal>
     );
 }