[ci skip] Remove faulty overrides in scrubber example.
[ci skip] Remove faulty overrides in scrubber example.

Add initializer to CommentScrubber example replacing the method overrides with setting
tags and attributes.

Signed-off-by: Kasper Timm Hansen <daab9349e7897953586c7278844811677e111b79@gmail.com>

rails/rails-html-sanitizer