Revert handling of infeasible discrete parameters #145
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I observed a performance degradation from #121 (comment) in Optuna on HPO-bench:
![image](https://user-images.githubusercontent.com/23695091/210755387-924aa8b8-692f-4a37-ac43-a3eca0988a77.png)
(_CmaEsSampler_0_NopPruner:
CMA
, _CmaEsSampler_1_NopPruner:CMAwM
)I found out that this is caused by #136 and #140, which repair out-of-range discrete parameters in the same way as continuous parameters.
I'm not sure why this hurt the performance this much, but let me revert these changes for now. I confirmed that this PR brings the performance back to a similar level as the original:
![image](https://user-images.githubusercontent.com/23695091/210758030-4bb5d306-4143-4b9a-822f-3475efefe125.png)