Update constrained MOO tutorial with new constraint handling in qEI (#1967)

Summary:
ConstrainedMCObjective is deprecated, this updates the tutorial to properly use the constraints arg of qEI

Pull Request resolved: #1967

Reviewed By: SebastianAment

Differential Revision: D47993361

Pulled By: Balandat

fbshipit-source-id: 6542e044707d0fe08207d803993bd99a58960b04

Author: Balandat