[fix] ConfigMenu cre margins hold action (#4702)
[fix] ConfigMenu cre margins hold action (#4702)

See https://github.com/koreader/koreader/pull/4691#issuecomment-468905263
NiLuJe/koreader,Markismus/koreader,Frenzie/koreader,mwoz123/koreader,mihailim/koreader,koreader/koreader,Frenzie/koreader,koreader/koreader,poire-z/koreader,houqp/koreader,NiLuJe/koreader,poire-z/koreader,pazos/koreader,Hzj-jie/koreader