Nissan: fix steering wheel offset in some cases

[sshane]

commaai/opendbc#3423

Would have caused the car to have weird offsetting in the lane, as we were calculating a steering wheel offset from an angle the EPS didn't control against. This one is also much more precise

[github-actions]

Process replay diff report

Replays driving segments through this PR and compares the behavior to master.
Please review any changes carefully to ensure they are expected.

⚠️ 1 changed, 65 passed, 0 errors

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NISSAN - regen15D60604EAB|2025-04-08--23-06-59--0 [card]

  carState.steeringAngleDeg (5999 diffs)
    frame 1: 3.9000000953674316 -> 5.079999923706055
    frame 2: 3.799999952316284 -> 5.0
    frame 3: 3.799999952316284 -> 4.929999828338623
    frame 4: 3.799999952316284 -> 4.900000095367432
    frame 5: 3.799999952316284 -> 4.880000114440918
    frame 6: 3.700000047683716 -> 4.840000152587891
    frame 7: 3.700000047683716 -> 4.800000190734863
    frame 8: 3.5999999046325684 -> 4.760000228881836
    frame 9: 3.5999999046325684 -> 4.71999979019165
    frame 10: 3.5999999046325684 -> 4.670000076293945
    (... 5989 more)