Somewhat sped up `git commit` of modifications to unlocked files.

Avoid git reset here too, so I no longer need to care that it's much more
expensive than seems wise (but I asked the git list about that anyway).

It's not necessary to reset the staged file content from the index, as
the `git add` of the the symlink will replace it anyway.

`git commit` of unlocked files is still slow, since git still has to shove
their entire content into the index, only to have it be thrown away. So it's
still better to use `git annex add`

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