Update category-ads (#3222)

* remove ads attr from openaicom.imgix.net

imgix.net is serving for pictures, not ads/tracking

* category-ads: include more ad domains

data/category-ads-all

@@ -20,7 +20,6 @@ mgid.com @ads
 ns1p.net @ads
 pubmatic.com @ads
 sigmob.com @ads
-snapads.com @ads
 spotxchange.com @ads
 unimhk.com @ads
 upapi.net @ads