Design contests: Once a member has submitted "View Submissions" button must be displayed

Design contests: Once a member has submitted "View Submissions" button must be displayed on the challenge details page. https://test-community-app.topcoder-dev.com/challenges/8cabd850-7d44-4036-a5a1-90d38b7f7733 user: TonyJ/appirio123

<img width="1440" alt="Screenshot 2020-06-24 at 11 11 15 AM" src="https://user-images.githubusercontent.com/58783823/85505238-8033df00-b60b-11ea-9e00-027e6843eaaa.png">

Final Submission Guidelines

Git issue link: https://github.com/topcoder-platform/community-app/issues/4590