EventType V1B3: Use proper jsonpath for additional column printer

[matzew]

Fixes a typo from #8087

Proposed Changes

• as per title

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.82%. Comparing base (ea08684) to head (3cf412f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8097   +/-   ##
=======================================
  Coverage   67.82%   67.82%           
=======================================
  Files         367      367           
  Lines       17411    17411           
=======================================
  Hits        11809    11809           
  Misses       4864     4864           
  Partials      738      738           

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[Cali0707]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, matzew

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