Install separate copies of update-debian-edu-artwork

The theme subpackages only have a weak dependency on debian-edu-artwork whereas the latter depends on the former. This means on removal oth a theme subpackage debian-edu-artwork is already gone and the symlink to update-debian-edu-artwork is broken. Thus install separate copies with each subpackage, this way we still have a single source script (Closes: #1054338).

assigned to @sunweaver

Please undraft, this is the way to go for bookworm, for trixie, see my response to the referenced Debian bug report.

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merged