Fix how regularization with gradients is working

[JdbermeoUZH]

DoD:

• Either we do not use directions at all
• or we take their root_squared value before mapping them to specific directions histogram (map to only the [0, pi/2] range)

DoD:

• [ ] CDDPM only job with conditional free guidance

  • [ ] use three reg params

• [ ] CDDPM + DAE

  • [ ] use 3 reg params