t1409: check that `packed-refs` is not rewritten unnecessarily

There is no need to rewrite the `packed-refs` file except for the case
that we are deleting a reference that has a packed version. Verify
that `packed-refs` is not rewritten when it shouldn't be.

In fact, two of these tests fail:

* A new (empty) `packed-refs` file is created when deleting any loose
  reference and no `packed-refs` file previously existed.

* The `packed-refs` file is rewritten unnecessarily when deleting a
  loose reference that has no packed counterpart.

Both problems will be fixed in the next commit.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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