Cleanup ad domains (#2066)

* Remove domains that should not be blocked from -ads

Blocking them will cause some problems.

* Remove unnecessary ad domains

They are subdomains of other ad domains

* Remove facebook domains that should not be blocked

https://github.com/privacy-protection-tools/anti-AD/issues/892

https://github.com/notracking/hosts-blocklists/issues/157

data/letv-ads

@@ -1,14 +1,12 @@
 api.game.letvstore.com @ads
 ark.letv.com @ads
 dc.letv.com @ads
-dev.dc.letv.com @ads
 fz.letv.com @ads
 g3.letv.com @ads
 letv.allyes.com @ads
 minisite.letv.com @ads
 msg.m.letv.com @ads
 n.mark.letv.com @ads
-plog.dc.letv.com @ads
 pro.hoye.letv.com @ads
 pro.letv.com @ads
 stat.letv.com @ads