fix(mvux): Fix possible cross threading exception in refresh command (backport #2448)

[mergify]

closes #2444

Bugfix

Fix possible cross threading exception in refresh command

What is the current behavior?

Refresh command may remain CanExecute = false after a first execution

What is the new behavior?

🙃

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Internal Issue (If applicable):

---

This is an automatic backport of pull request #2448 done by [Mergify](https://mergify.com).

[jeromelaban]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[modula2019]

@dr1rrb Good day to you and your team. I am still having this issue I reported here. https://github.com/unoplatform/uno.extensions/issues/2444
I thought the bug was fixed in release 4.2. The bug persists with Desktop platform using uno.sdk 5.3.90. The repro is attached here again.
UnoApp1.zip