fix: Correct minor spelling issue in config.rs

Christian Heuselrequested to merge
gromit/signstar:143-fix-spelling into main

It seems like the 2.4.0 version of codespell does deem "re-use" incorrect, therefore change it to the suggested "reuse" spelling.

Fixes #143 (closed)

Signed-off-by: Christian Heusel christian@heusel.eu

Closes #143 (closed)

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