kobo: always set light intensity to 0 if state is nil or false
kobo: always set light intensity to 0 if state is nil or false

Markismus/koreader,koreader/koreader,NiLuJe/koreader,robert00s/koreader,Frenzie/koreader,lgeek/koreader,NickSavage/koreader,NiLuJe/koreader,apletnev/koreader,chihyang/koreader,poire-z/koreader,frankyifei/koreader,mihailim/koreader,pazos/koreader,houqp/koreader,mwoz123/koreader,Hzj-jie/koreader,poire-z/koreader,Frenzie/koreader,koreader/koreader