Remove a duplicate sanitizer from the proxy config

[scbedd]

Brought to my attention by @chlowell

[benbp]

LGTM. Wonder if a hashset would be useful here.

[scbedd]

<I somehow edited your comment instead of responding? somehow?>

Hashsets don't maintain order, which we enforce for simplicity of debugging sanitizers by the users.

I see what you're asking now. I could do it that way, yea. Just...didn't. The hashset value probably wouldn't collide in a way that is useful anyway, as we'd use the ID of the sanitizer as the key, not the regex of it.