fix filtered / at the end of URIs
fix filtered / at the end of URIs

file_mod->download() depends on the trailing slash to determine whether
the user wants highlighting or not so we prevent it from being removed.

Signed-off-by: Florian Pritz <753f544d2d01592750fb4bd29251b78abcfc8ecd@server-speed.net>

jreinert/filebin,jreinert/filebin,Bluewind/filebin,jreinert/filebin,Bluewind/filebin,jreinert/filebin,Bluewind/filebin,jreinert/filebin,jreinert/filebin,Bluewind/filebin,Bluewind/filebin