OSD custom elements: add 16-bit icon support

[error414]

CUSTOM_ELEMENT_TYPE_ICON_GV and CUSTOM_ELEMENT_TYPE_ICON_LC were hard-casting the resolved icon value to uint8_t, limiting icons to 0–255. This change lifts that restriction to match the existing 16-bit handling already present in CUSTOM_ELEMENT_TYPE_ICON_STATIC.

Configurator PR: iNavFlight/inav-configurator#2643

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[github-actions]

Test firmware build ready — commit b200445

Download firmware for PR #11608

237 targets built. Find your board's .hex file by name on that page (e.g. MATEKF405SE.hex). Files are individually downloadable — no GitHub login required.

Development build for testing only. Use Full Chip Erase when flashing.

[Jetrell]

@error414 Sorry for the false report in the configurator side. I stupidly didn't load the fw side with it..
I checked it again. And I'm happy to say you got it to work. Very nice.

[error414]

@Jetrell it's ok :). thank you very much for test.

I knew about that restriction from the begining, it was on my list for a long time.