Remove absolute URL condition from HMR request checker.

[navaru]

Condition not required as URLs are absolute in most cases.

<script defer async src="/0.js"></script>
// element.src -> https://domain.com/0.js

normalizeURL("domain.com/0.js")
// https://domain.com/0.js

[ScriptedAlchemy]

Any tests that could be written for this function? I'll need to take this to webpack and having some tests as to what's going to pass/fail the regex would be helpful

[faceyspacey]

🎉 This PR is included in version 4.5.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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