Filter the Completed Challenges in Challenge List view

[sachintom999]

• This PR fixes the issue #129 - Dont display challenges with Done status in the Challenges List view

Changes

• Added a filter to exclude challenges with status as Done

Testing

• tested and verified in the UI

Unrelated note : @dogukanteber, going forward to prevent wastage of efforts,

• should I request to assign an issue to me
• OR can I claim the issue I am working on & start working on it ?

[dogukanteber]

Thank you for your contribution @sachintom999!

You can leave a comment under the issue you want to work on and I can assign it to you.