switch mint3 to jubjub temporarily

run_mint3.sh

@@ -1,6 +1,6 @@
 #!/bin/bash -x
-python scripts/preprocess.py proofs/mint2.psm > /tmp/mint2.psm || exit $?
-#python scripts/preprocess.py proofs/jubjub.pism > /tmp/mint2.psm || exit $?
+#python scripts/preprocess.py proofs/mint2.psm > /tmp/mint2.psm || exit $?
+python scripts/preprocess.py proofs/jubjub.pism > /tmp/mint2.psm || exit $?
 python scripts/vm.py --supervisor /tmp/mint2.psm --output mint.zcd || exit $?
 cargo run --release --bin mint3