chore: Fix incorrect property name referenced in comment

[Gudahtt]

Explanation

This comment has had this mistake since #6337

References

Fixes mistake in comment introduced in #6337

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Fixes a comment in BaseController.ts to reference messenger instead of messagingSystem.

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