fix(plugin-react): restore usage of extension instead of id

[frandiox]

Description

The id parameter could contain a querystring so the extension checks should be done using the extension variable. This was the case until it was reverted in #5255 but probably not on purpose (@aleclarson is this correct?)

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[Shinigami92]

Is this a bug fix or an optimization? 🤔

[patak-cat]

Any chance to add a test for this one?

[aleclarson]

Sorry, that slipped by when rebasing an older PR. 😬

Perhaps a test could be added later, but I don't expect this regression to happen again.

[IanVS]

Hah, I just spent most of the day figuring out what was going on in my tests, and was about to submit this exact PR. 😆 Thanks for being a step ahead of me, @frandiox. This should also close #5752.