Fix 'm3u-prune' and 'xml-prune' — XMLHttpRequest.prototype.send()

[AdamWr]

It looks like that sometimes changes are not applied even if content is replaced, I suppose that it might be related to XMLHttpRequest.prototype.send which is not mocked.
This issue occurs here - AdguardTeam/AdguardFilters#151052

Using the same method/approach like in trusted-replace-xhr-response should fixes this issue.