DEV: Resolve this child category pending request spec (PR #10604)

There is a request spec that was ignored with the xit flag almost a year ago and every time you generate the api docs with

rake rswag:specs:swaggerize

it shows the output of this pending test and I guess I finally got sick of looking at it, so here is a fix for it.

Original Commit: d84c34ad7523c6f894315dcbfc0b215dff3b3707

GitHub

Thanks @oblakeerickson