Double encoding of anchor tag href

Hey,

I've been using your amazing library to extract links from DOM content in a service worker and noticed that achor tags which, for example, lead to some file which has already encoded space characters in the URL (www.test.com/path%20to%20some%20file.pdf) end up with a broken href because the % character is encoded again (www.test.com/path%2520to%2520some%2520file.pdf).

I have a workaround by just calling decodeURIComponent on the href attribute before processing it but I guess that is not the intended behavior and shouldn't be like that.
I am sure that it's related to https://github.com/WebReflection/linkedom/issues/49 and the fix for it here https://github.com/WebReflection/linkedom/blob/5b31c583c79423d97fa1982d9a30a8f0a0982485/cjs/html/anchor-element.js#L18

I would guess and hope it's not a complicated fix.

Thanks a lot for your work!

Start with cjs/html/anchor-element.js at the linked implementation and compare it with the related linkedom issue and fix. Reproduce the example using an href containing %20, then verify that reading the anchor preserves the existing encoding instead of producing %2520.