Renable CI descriptorpublic test

[sanket1729]

This is currently disabled because of upstream issues with uncompressed public keys in fuzzing mode. Once that is fixed, we should enable the roundtrip test.

[sanket1729]

For context, I did put in 1/2 day to figure out custom fuzzing keys that BlueMatt implemented but did not make much progress. This still remains a TODO for a good weekend

[sanket1729]

To be clear, this is a bug in rust-secp fuzzing mode. Not a bug here.