Universal SPI display backlight control broken

[SvenMb]

PROBLEM DESCRIPTION

In uDisplay_SPI_panel.cpp the return code for SPIPanel::displayOnff() should be false to allow the code in uDisplay_control.cpp to switch the GPIO for the backlight/backpanel.

Also I had to fix the GPIO# for backlight in the sourcecode to got it working, even I set the GPIO to backlight and put this GPIO in display.ini. so something else is wrong, but I was unable to track it down.

see discusion #24271

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[arendst]

See #24278

[SvenMb]

At least for me this resolves the problem.