Fix class mismatch: rename CommentTest to CommentSystemTest

[vk672]

Fixes #11620

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[vk672]

Hi! I have submitted a PR for this issue.
Please review it. This is my first contribution!

[vk672]

Hi @publiclab/reviewers !
I have fixed the class mismatch error in issue #11620.
Please review my PR. This is my first contribution to Public Lab!