Remove adblock agents

[scripthunter7]

The build inserts an unnecessary ! before the adblock agent: https://github.com/AdguardTeam/FiltersRegistry/blob/master/filters/ThirdParty/filter_203_hufilter/filter.txt

I guess the tool doesn't know this adblock agent, but it removes [Adblock Plus 2.0] properly, for example

Possible agents:

• [AdBlock], [Adblock Plus], [uBlock] / [uBlock Origin], [AdGuard]

See GitHub Linguist agent heuristics: https://github.com/github/linguist/blob/bf853f1c663903e3ee35935189760191f1c45e1c/lib/linguist/heuristics.yml#L681-L700

[scripthunter7]

Update:

! is caused by template design: https://github.com/AdguardTeam/FiltersRegistry/blob/master/filters/ThirdParty/filter_203_hufilter/template.txt

The only issue is that the adblock agent is not deleted, but the ! not related to this. I submitted a PR.

[tvinzz]

merged