[Freestyler] Another form submission button bugfix

Set the submit button to disabled when the form is being closed, so
that on an eventual re-opening of a fresh form the submit button is
disabled.

Fixed: 380374996
Change-Id: I7e9b403dc561049246566fbe85498ed2edb5d904
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6038943
Reviewed-by: Nikolay Vitkov <[email protected]>
Commit-Queue: Wolfgang Beyer <[email protected]>
Auto-Submit: Wolfgang Beyer <[email protected]>

Author: wolfib

front_end/panels/freestyler/components/UserActionRow.ts

@@ -155,6 +155,7 @@ export class UserActionRow extends HTMLElement {
 
   #handleClose = (): void => {
     this.#isShowingFeedbackForm = false;
+    this.#isSubmitButtonDisabled = true;
     this.#render();
   };