Update PDFAcroCheckBox.ts

[MockingMagician]

Can set value when checkbox as multiple widget

What?

Actually, unable to set value for a checkbox that as multiple widgets

Why?

Can not fill my pdf because of that

How?

iterate over all available widget to get all possible response

Testing?

Works for my use case

New Dependencies?Nope

Screenshots

Nope

Suggested Reading?

YES

Anything Else?

Nope

Checklist

• [ X] I read CONTRIBUTING.md.
• [ X] I read MAINTAINERSHIP.md#pull-requests.
• [ ] I added/updated unit tests for my changes.
• [ ] I added/updated integration tests for my changes.
• [ ] I ran the integration tests.
• [ X] I tested my changes in Node, Deno, and the browser.
• [ X] I viewed documents produced with my changes in Adobe Acrobat, Foxit Reader, Firefox, and Chrome.
• [ ] I added/updated doc comments for any new/modified public APIs.
• [ X] My changes work for both new and existing PDF files.
• [ ] I ran the linter on my changes.

[MockingMagician]

I was fixing directly from github, it's a bit messy, I will do it from my IDE... forget this PR for now

[MockingMagician]

I will redo it in a cleanest way