Git: Really consider untracked flag

Default behavior is to show all untracked files. To hide them,
we need to pass --untracked-files=no

Change-Id: I45ad6323273112e6724127d4bd8e8687066467f4
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>