fix #1570 to disable swipe to go back by default
fix #1570 to disable swipe to go back by default

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