FileManagerMenu: show tab from gesture position (#3792)
FileManagerMenu: show tab from gesture position (#3792)

As it was done for ReaderMenu in 6e303e7
NiLuJe/koreader,Markismus/koreader,Frenzie/koreader,koreader/koreader,mihailim/koreader,poire-z/koreader,mwoz123/koreader,Hzj-jie/koreader,NiLuJe/koreader,poire-z/koreader,lgeek/koreader,houqp/koreader,pazos/koreader,Frenzie/koreader,koreader/koreader