[whatwg/fetch] "Extracting header list values" algorithm returns a list, but is being treated as a string (#559)

https://fetch.spec.whatwg.org/commit-snapshots/f3bb21991abdd335175fcc5d26a0d0b7b380d4fe/#cors-preflight-fetch

> Let methods be the result of extracting header list values given \`Access\-Control\-Allow\-Methods\` and response’s header list\.
> 
> If methods is \`\*\`, then set methods to a new list containing \`\*\`\.

There are other places in the spec currently that has this pattern where we're checking if the resultant value from the "extract header list values" algorithm is a string (in this case `"*"`), but the return type of that algorithm is clearly a list.

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