[advancedcontentfilter] Fix Hook-call during install #922

Merged

MrPetovan merged 3 commits intofriendica:2019.12-rcfrom

nupplaphil:bug/7989-advancedcontfilter

Dec 23, 2019

Commits on Dec 22, 2019

Commits on Dec 23, 2019

Restored Hook::register and added Hook::add
nupplaphil
committed