Actually remove ThreatMetrix

Forgot -i when grepping

rules_asn/first-party.txt

@@ -4,8 +4,6 @@ AS50234
 AS44788
 AS19750
 AS55569
-# ThreatMetrix
-AS30286
 # Webtrekk
 AS60164
 # Act-On Software

tests/first-party.csv

@@ -1,7 +1,6 @@
 url,allow,deny,comment
 https://www.red-by-sfr.fr/,static.s-sfr.fr,nrg.red-by-sfr.fr,Eulerian
 https://www.cbc.ca/,,smetrics.cbc.ca,2o7 | Ominuture | Adobe Experience Cloud
-https://www.discover.com/,,content.discover.com,ThreatMetrix
 https://www.mytoys.de/,,web.mytoys.de,Webtrekk
 https://www.baur.de/,,tp.baur.de,Otto Group
 https://www.liligo.com/,,compare.liligo.com,???