Differential thrust in Tailsitter is link to aileron not rudder

[bluecat1997]

Describe the bug
In new firmware there is a new parameter for VTOL aircraft "VT_FW_DIFTHR_EN" used to enable Differential thrust in forwards flight. But I'm a Quad x Tailsitter , when I enable this, the motors not responded to my yaw control but link to my roll control. I think maybe this is because tailsitter's axis of fixedwing is different from multicoptor. maybe we can try if it can reproduce in a Dual tailsitter

To Reproduce
Steps to reproduce the behavior:

1. flash firmware Px4 1.9.0 (Git revision ea48cd4970000000)
2. set parameter "VT_FW_DIFTHR_EN" to 1 ; "VT_FW_DIFTHR_SC" to 0.5
3. armed in FW mode and turn yaw stick there is no response on all motor
4. armed in FW mode and turn roll stick there is Differential thrust response

Expected behavior
armed in FW mode and turn yaw stick there is Differential thrust response

Log Files and Screenshots
put here later

[stale]

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