fix: call SetCanActivate in setFocusable

[zcbenz]

Description of Change

Fix #21459.

This PR fixes the issue that calling setFocusable(true) could not turn an unfocusable window back to focusable.

Checklist

• PR description included and stakeholders cc'd
• npm test passes
• tests are changed or added
• relevant documentation is changed or added
• 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: Fix BrowserWindow.setFocusable(true) not working on Windows.

[release-clerk]

Release Notes Persisted

Fix BrowserWindow.setFocusable(true) not working on Windows.

[trop]

I was unable to backport this PR to "6-1-x" cleanly;
you will need to perform this backport manually.

[trop]

I was unable to backport this PR to "7-1-x" cleanly;
you will need to perform this backport manually.

[trop]

I have automatically backported this PR to "8-x-y", please check out #21854

[trop]

@zcbenz has manually backported this PR to "7-1-x", please check out #21855

[trop]

@zcbenz has manually backported this PR to "6-1-x", please check out #21856