Simple globs fail when `withBasePath` is used

[bdukes]

When using the following combination of features, I'm seeing zero matches:

• withBasePath
• glob (when the glob does not traverse directories)
• crawl('dirname') (i.e. it does not reproduce for the current directory, perhaps due to the fix for Corner case when globbing current directory returns zero results #92)

Assuming txt files exist in a content directory, the following simple program demonstrates the issue:

import { fdir } from "fdir";

const files = new fdir().withBasePath().glob('*.txt').crawl('content');
console.log(files);

I've created an example reproduction at https://github.com/bdukes/fdir-issue-reproduction which uses CLI flags to demonstrate that it's only the combination of these features that causes an issue, but adjusting any one of them will give the expected results.