[$25] Public Forums category highlighted when in Challenge Forums

[Oanh-and-only-Oanh]

Bug: the Public Forums category on right hand side is highlighted when I am in a challenge forum
how to reproduce bug:

1. register for challenge
2. click on Challenge Discussion in details page
3. See error
   
   Expected behavior:
   Challenge Forums category should be highlighted

[atelomycterus]

Duplicated #512.

[atelomycterus]

@jmgasper Please apply PRs:

• Issues-511: Replay placement, Issues-523, Issues-518 #531
• Issues-518: Fixed highlighting a menu item in the left nav forums-groups-plugin#76

Thanks!

[jmgasper]

Challenge https://www.topcoder.com/challenges/d8b64963-9b2f-4054-9705-d9e09931ab39 has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/d8b64963-9b2f-4054-9705-d9e09931ab39 has been assigned to obog.

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