Update and rename comment_test.rb to comment_system_test.rb

[0D1nn8502]

My first open source contribution!! (better late than never).

Fixes #11620

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[codeclimate]

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[0D1nn8502]

Hello @publiclab/reviewers! This is my first open source contribution. I see that tests/system-tests and comment-system-tests(pull_request) has failed and I dont understand the error message.