test suite: gdr-fresh: Drop use of git-deborig and fix dependencies

b765388a4cea
  "test suite: Test dgit calling git-debrebase on new debianisation"
failed to update the test dependencies, and does not work in a formal
autopkgtest run because dgit is not installed.

Additionally, Because scripts in devscripts have their own individual
dependencies, and the dependencies for git-deborig differ between
stretch and sid, It is not reasonably possible to write a dependency
which allows git-deborig to work.  This is another reason why this
test does not work in a formal run (this time, failing only on
sid/buster).

So, drop use of git-deborig, and the resulting dependency on
devscripts.  (dgit and git-debrebase pull in devscripts anyway, so
that is academic.)

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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