Error when deleting sketch that contains file url not on s3

[catarak]

Nature of issue?

• Found a bug

Details about the bug:

• Web browser and version: N/A
• Operating System: N/A
• Steps to reproduce this bug:

In testing #1762, I found that the script will fail when deleting the uploaded sketches. I believe it is a bug in deleteProject.js, which doesn't check if the url is specifically an AWS S3 url!

[bomanimc]

Thanks for catching this!