npm / cli / #3363

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fix(install): command completion with single match

During a refactoring of the tests a bug was found in the install command
completion that would return nothing if there was a valid match, this
fixes that bug and also makes the tests actually test things.

PR-URL: https://github.com/npm/cli/pull/4023
Credit: @wraithgar
Close: #4023
Reviewed-by: @lukekarrys

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