fix: Windows checkboxChecked edge case

[codebytere]

Description of Change

Closes #21831.

Most of the checkbox plumbing was fixed earlier, but one edge case remained; if you started with checkbox_checked false, and then checked true. This final bit: checkbox_checked ? verificationFlagChecked : false led to the following logic flow:

checkboxChecked: false -> user leaved unchecked -> checkboxChecked === false (correct ✅)
checkboxChecked: true -> user unchecks -> checkboxChecked === false (correct ✅)
checkboxChecked: false -> user checks -> checkboxChecked === false (incorrect 🔴 )
checkboxChecked: true -> user leaves checked -> checkboxChecked === true (correct ✅)

We shouldn't be gating the final return value on checkbox_checked; it only reflects the initial checked state. We simply need to return verificationFlagChecked, as it defaults to false anyway.

cc @nornagon @deepak1556

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• PR title follows semantic commit guidelines
• PR release notes describe the change in a way relevant to app developers, and are capitalized, punctuated, and past tense.

Release Notes

Notes: Fixed an edge case in checkbox logic on Windows.

[nornagon]

how much check could a checkbox check if a checkbox could check checks?

[release-clerk]

Release Notes Persisted

Fixed an edge case in checkbox logic on Windows.

[trop]

I have automatically backported this PR to "7-1-x", please check out #21860

[trop]

I have automatically backported this PR to "8-x-y", please check out #21861