gvfs-ls: Complete mounts with terminating slash
gvfs-ls: Complete mounts with terminating slash

g_file_get_uri returns uris without terminating slash if there is a path
element, e.g.:
dav://server/
dav://server/path

We have to be sure that terminating slash is appended for mounts when
listing possible completions, because mounts are always directories.

https://bugzilla.gnome.org/show_bug.cgi?id=751145

gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs