Added Test: for lexeme download cmd in CLI and Fix typo

[axif0]

Contributor checklist

• This pull request is on a separate branch and not the main branch
• I have tested my code with the pytest command as directed in the testing section of the contributing guide

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Description

• Added tests for for lexeme download cmd in CLI
• Fix typo in file URL construction in download_wd_lexeme_dump function

Related issue

• Outreachy Scribe-Data tests round 1 #529

[github-actions]

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Maintainer checklist

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[andrewtavis]

Thanks for the great additions to the testing suite, @axif0! Really awesome to have the tests of the new functionality being added as we go 😊