Backport of UI: Fix blank secret on KV create > cancel

Co-authored-by: Chelsea Shaw <82459713+hashishaw@users.noreply.github.com>

changelog/22541.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Fix blank page or ghost secret when canceling KV secret create
+```

ui/app/routes/vault/cluster/secrets/backend/secret-edit.js

@@ -342,6 +342,7 @@ export default Route.extend(UnloadModelRoute, {
           )
         ) {
           version && version.rollbackAttributes();
+          model && model.rollbackAttributes();
           this.unloadModel();
           return true;
         } else {