Fix bug in override of coordination directory

[gmloose]

The override of the coordination directory that a user could make was not applied correctly. Instead of setting self.coordination_dir the variable self.workDir would be modified. This has been fixed.

Changelog Entry

To be copied to the draft changelog by merger:

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Reviewer Checklist

• Make sure it is coming from issues/XXXX-fix-the-thing in the Toil repo, or from an external repo.
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    contrib/admin/test-pr otheruser theirbranchname issues/XXXX-fix-the-thing
    

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• Read through the code changes. Make sure that it doesn't have:
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Merger Checklist

• Make sure the PR passes tests.
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• Copy its recommended changelog entry to the Draft Changelog.
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[adamnovak]

I'm not going to bother waiting for a re-test on this, I'm just going to merge it.

[adamnovak]

Actually we haven't ever had this pass full CI, so we probably should wait for that at least once.