fix: watching files outside cwd

[mark-wiemer]

PR Checklist

• [x] Addresses an existing open issue: fixes #5355
• [x] That issue was marked as status: accepting prs (note that I was the one that added that tag!)
• [x] Steps in CONTRIBUTING.md were taken

Overview

In #5256 we changed the watched path from watchFiles to . (cwd). Nobody commented on this, and it broke this behavior. Reverting that line fixes the reported issue in the provided repro

[mark-wiemer]

Draft until:

• [ ] tests added
• [ ] understand why we may have wanted to make the reverted change in the first place (or confident that it was a mistake)

[mark-wiemer]

@mochajs/maintenance-crew would appreciate your insights here, looks like this was a recently-introduced bug but I'm certainly no expert :)

[voxpelli]

I'm no expert on this either but it looks sensible as a fix

[mark-wiemer]

Closing (at least for now) in favor of #5379