Fix a typo. Need follow up tests

Fixing this error:

{"error":"NameError","message":"undefined local variable or method `event' for #<Triage::Handler:0x0000562c4081e030>\nDid you mean?  @event"}

This can be found at https://gitlab.com/gl-quality/eng-prod/triage-test/hooks/1921220/hook_logs/318695669

Where I set up a dummy project to test things out.