[$25] Announcement pop up option two has recent discussions

[sdgun]

Steps
Log in as an admin user
Go to a discussion and try to announce it

Option 2 mentions 'recent discussions', but we have removed recent discussions from the left nav

[jmgasper]

Challenge https://www.topcoder.com/challenges/771748c9-fa0d-4386-99b6-1f0cc361b242 has been created for this ticket.

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[jmgasper]

Challenge https://www.topcoder.com/challenges/771748c9-fa0d-4386-99b6-1f0cc361b242 has been assigned to obog.

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[atelomycterus]

@jmgasper Please apply PR-#448. Thanks!

Testing