In Audio app, update iq_phase_cal in radio when starting SPEC mode

[NotherNgineer]

The iq_phase_calibration value from the .ini file was not being programmed into the radio when starting Spec mode in the Audio app, therefore it was only taking effect if the user changed the value while SPEC mode was running.

Fixes this minor issue in PR #1963, per @Brumi-2021

Test version here:
https://discord.com/channels/719669764804444213/722101917135798312/1216473993113112636

[gullradriel]

Nice catch !
Thanks @Brumi-2021 & @NotherNgineer :-)

[Brumi-2021]

Thanks to both ! @NotherNgineer @gullradriel

I have already validated your test binary , in both r6 (max2837 ) , r9 (max2839) and now it works in both flawlessly .
Now , at first booting follows exactly the saved rx_iq_phase_error_cal value in the rx_audio.ini. (tested with uncalibrated / calibrated manual input data) .

Note : as far as I can see , good default data for r6 (max2837 ) is around 13 or 15 /31 , , r9 (max2839) 25 to 31 /63
(so if you can not find a proper set up to calibrate it , you can use a middle value of the range as a good default ).

Thanks

[gullradriel]

How different is a IQ good value tunes signal vs a RxSat good value tuned one ?

[gullradriel]

Ho I see. It's different, it's image rejection.
I have to see if it can help the looking glass !

[gullradriel]

Ho my god !
It helps a lot in looking glass, nearly killing the ghost when capturing a keyfob @ 868MHZ !!!!!