Correct typo in comment in plugin.go

[Nog-Frog]

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[mattermod]

Hello @Nog-Frog,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

Per the Mattermost Contribution Guide, we need to add you to the list of approved contributors for the Mattermost project.

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[Nog-Frog]

/check-cla

[mickmister]

Thanks for your contribution @Nog-Frog!