git ls-files should not show worktree files as untracked

[乙酸鋰 <ch3cooli@xxxxxxxxx>]

Hi,
Using git 2.6.2
I think worktree should behave consistently like submodule

Run following commands
```
echo 1 > 1.txt
git init
git add 1.txt
git commit -m "initial commit"
echo 2 > 2.txt # untracked file
mkdir def
cd def
git clone --separate-git-dir ../.git/ghi .. . # simulate an untracked submodule
cd ..
git worktree add abc

git ls-files --exclude-standard --full-name --others
```

Actual: list all the files of abc
2.txt
abc/1.txt
def/

Expected: just the directory of abc
2.txt
abc/
def/


Hint: path.c: git_path_submodule() should read "commondir" ?
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