gvfs: reenable gvfs-smb

samba was disabled in 12cf4fa8

 because it
caused OOM condition. This could not be reproduced any more. Likely reason for
OOM wasmissing gdu-volume-monitor which is build by an own recipe nowadays.

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>