Potential fix for code scanning alert no. 21: Unsafe expansion of self-closing HTML tag

[kueken]

Potential fix for https://github.com/E2OpenPlugins/e2openplugin-OpenWebif/security/code-scanning/21

To fix the unsafe expansion of self-closing HTML tags, we should avoid using a regex-based approach to modify HTML structure, especially on potentially untrusted input. Instead, we should parse the HTML using a trusted DOM parser and reconstruct it, or use a well-tested sanitization library to handle such transformations. Since we are restricted to edits within the provided code, the safest approach is to modify htmlPrefilter to avoid using the regex to expand self-closing tags. The best solution is to leave the input HTML unchanged, or, if possible, use a DOM approach to parse and serialize HTML fragments safely. However, since we cannot introduce a new complex parser and can only add well-known imports, we should make htmlPrefilter a no-op (return the input unchanged) or, if possible, use a well-known library such as DOMPurify to safely parse and serialize the HTML.

Steps:

• In sourcefiles/modern/plugins/jquery/jquery-2.2.4.js, replace the body of htmlPrefilter so that it simply returns html (no-op).
• Optionally, add a comment explaining the change for future maintainers.
• No additional imports are needed for a no-op.
• This change avoids expanding self-closing tags and is safe.

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