Revert D22227939: [TB] Add support for hparam domain_discrete
Test Plan: revert-hammer
Differential Revision:
D22227939 (https://github.com/pytorch/pytorch/commit/4c25428c8c7cd1667b9c5d64439339d276801403)
Original commit changeset: d2f0cd8e5632
fbshipit-source-id: c4329fcead69cb0f3d368a254d8756fb04be742d
