[$50]Checkpoints tab is missing for design contests

[SathyaJayabal]

Checkpoints tab is missing for design contests
example:
https://beta-community-app.topcoder.com/challenges/06b33615-7693-4360-bf5e-4f532169e42c
https://www.topcoder.com/challenges/30135486
https://beta-community-app.topcoder.com/challenges/dca8b23e-a8c0-4bdb-a93e-6da8b481de94
https://www.topcoder.com/challenges/30135490

cc @lakshmiathreya

[SathyaJayabal]

verified on beta (code freeze branch)