fix ext reference
fix ext reference

hssm/anki,go38/anki,eduOS/anki,sunclx/anki,jakesyl/ruby-card,jakesyl/ruby-card,florianjacob/anki,jkitching/anki,abeyer/anki,ospalh/libanki3,xuewenfei/anki,weihautin/anki,socialpercon/anki-1,kenjhim/anki,Arthaey/anki,weihautin/anki,subfusc/anki,hssm/anki,Stvad/anki,LucasCabello/anki,holycrepe/anki