[fix, UX] Remove rounded corners from fullscreen History (#3256)
[fix, UX] Remove rounded corners from fullscreen History (#3256)

Prevent visibility of readers's footer edges.
pazos/koreader,koreader/koreader,poire-z/koreader,apletnev/koreader,Markismus/koreader,Hzj-jie/koreader,mwoz123/koreader,NiLuJe/koreader,houqp/koreader,lgeek/koreader,Frenzie/koreader,Frenzie/koreader,koreader/koreader,mihailim/koreader,poire-z/koreader,NiLuJe/koreader