Fix #197493 www.c-span.org

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• This is not an ad/bug report;
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What problem does the pull request fix?

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• Missed ads or ad leftovers;
• Website or app doesn't work properly;
• AdGuard gets detected on a website;
• Missed analytics or tracker;
• Social media buttons — share, like, tweet, etc;
• Annoyances — pop-ups, cookie warnings, etc;
• Filters maintenance.

What issue is being fixed?

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Fix #197493

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