Revert "ignore unstable tests"

This reverts commit bd7ef5d445071329a3b49b1f8be71b602226bbec.

src/thin_client.rs

@@ -596,7 +596,6 @@ mod tests {
     }
 
     #[test]
-    #[ignore]
     fn test_register_vote_account() {
         solana_logger::setup();
         let leader_keypair = Arc::new(Keypair::new());