Fix challenge cleanup callback for Rails 5.2

Description

When a mod deletes a challenge, the claims and signups associated with it should disappear from the collection and from the users' pages. The upgrade broke the callback, so we just want to verify that it still works.

Environment

None

Status

Assignee

elzj78 (Elz)

Reporter

elzj78 (Elz)

Roadmap

Challenges

Priority

Medium

Affects versions

0.9.254

Fix versions

None

Components

BackEnd

Difficulty

Medium

Required Access Level

None

Epic Link

Milestone

Internal 0.9
Configure