fetch with relative string as argument is not resolved correctly

[jespertheend]

Reduced test case can be found at https://webgpu-inspector-with-string-fetch.glitch.me/

Basically I'm doing:

const response = await fetch("./static/test.txt");
console.log(await response.text());

and instead of resolving relative to the url of the current page, it resolves relative to the script that called fetch.

[brendan-duncan]

I pushed a fix for this to git. I'll still continue to test this, and improve the Worker patching, as I get some more free time.