Revert "implement _replace_nearly_value function"

This reverts commit e229783f66f5bd0135f1e36161e3d5751843ec2f.

Conflicts:
	sklearn/preprocessing/data.py
implement scale function, without `isclose()`

- improve floating point error (#3722)
- idea
  - When array elements is all same value, `std` sometimes has floating point error(`std` should be 0).