don't default to a button in prefs dialog
don't default to a button in prefs dialog

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