[Bug] Indentations aren't minified.

With the defaults enabled, the undermentioned: [^1]

[^1]: [`mysociety/alaveteli/issues/8958#issue-3566436614`](https://github.com/mysociety/alaveteli/issues/8958#issue-3566436614)

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New updates for the request 'Request for source code that once was public'
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No source file or test is named. Reproduce the reported before-and-after HTML with default options, then locate the JavaScript entry point that handles indentation and whitespace; done means indentation is removed while the embedded iframe and srcdoc content remain valid and match the expected minified output.

Written by the indexing model from the issue text.