Fix sage.misc.package_dir doctest after #32874

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CC:  @antonio-rojas

Component: **misc**

Author: **Matthias Koeppe**

Branch/Commit: **[`50b7486`](https://github.com/sagemath/sagetrac-mirror/commit/50b7486518c54ac32c358e2811c188aea3842c84)**

Reviewer: **Antonio Rojas**

_Issue created by migration from https://trac.sagemath.org/ticket/34674_

