3D-mode fix

[nerdCopter]

• this seems to have fixed it. motor output signals are correct.
• needs 3D flight testing and feedback
• please test https://github.com/emuflight/dev-unstable/releases/tag/20240618.193242-hex
• Tested good without props on BLHeli32 32.9.5 and BlueJay 0.16.
• Tested good with props on Bluejay 0.16. I did not "fly", but it rotates each axis properly and was able to hover inverted.
• BlueJay 0.17, 0.18, 0.19 are known to have broken 3D startup power. Seemingly fixed in BlueJay 0.21-RC1, but BlueJay developers would like BlackBox logs for further analysis.

Please test-fly and report feedback this PR or Discord.

---

• tentative 3D-mode fix
  • broken in Mixer smoothing (Motor Output Mixer) (Thrust Linearization) #398
  • fixes Issue：The motor that pushes backwards in 3D flight mode responds incorrectly #873
  • fixes The 3D mode of the Iflight succex-e f7 is not available EmuConfigurator#523

[nerdCopter]

my initial commit was proper, so force-pushed it.

[nerdCopter]

merging this, i tested enough to feel comfortable and no one stepping up to test it.