Can add duplicates to the Final Deliverables

[codejamtc]

Steps to reproduce the problem

1. Open https://challenges.topcoder-dev.com/ and login as Admin
2. Select a project from the list 'Test v5 {codejam} - 0001'
3. Click 'Launch New'
4. Select Work Type=Design; Format=Challenge; Name=Test
5. Click 'Continue Set-Up'
6. Go to 'Final Deliverables'
7. Enter "JPG' and click 'Add File Type' button
8. Enter "JPG' and click 'Add File Type' button
9. Try to select 'JPG'

Actual behavior

• Can add duplicates to the Final Deliverables. Even after adding the deliverable, only one can be selected

Expected behavior

• Should not allow duplicates on Final Deliverables

Environment

- OS: HP 15-dw1xxx 15.6 inch; Window 10
- Browser (w/version): Chrome 85.0.4183.83
- User role (client, copilot or manager): Admin
- Account used: TonyJ

[vikasrohit]

It has been fixed with #782 (comment).

[vikasrohit]

fyi, it is still case insensitive i.e. it would allow jpg and JPG both.

[codejamtc]