[$30] Hide "My Active Challenges" on Dashboard

[Oanh-and-only-Oanh]

The "My Active Challenges" is not accurate and therefore not helpful. Please hide the "My active challenges" view and all challenges cards under that tab. See screenshot of what to hide.

User can still track their "active challenges" under "my challenges" filter on the listings page.

[crazyk07]

Contest https://www.topcoder.com/challenges/30143519 has been created for this ticket.

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[crazyk07]

Contest https://www.topcoder.com/challenges/30143519 has been updated - it has been assigned to luizrrodrigues.

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