fix(web): cannot upload folder with more than 100 files

[alextran1502]

Fixes #14283

[bo0tzz]

I don't know the intricacies of recursion in JS, will that cause any issues?

[alextran1502]

I tested, and it works as expected so besides semantically ugly, I don't think there is issue

[jrasm91]

This will work fine, but it would be better to write it in a non-recursive way imo. A while loop would be better. You'd just need a utility function to convert readEntries to a promise.