fix #3141: 12-bits is 0xFFF (or 0xFF0) CAME/NICE 12-bit

[jamisonderek]

What's new

• Fixes CAME 12-bit and NICE 12-bit to generate a random 12-bit key instead of a 16-bit key. The code was already only transmitting a 12-bit key, so this just makes the generated .SUB file 12-bits. Loading a previously generated .SUB file will still show the 16-bit key (the user can manually edit their .SUB file to only have the last three digits set if they care).

Verification

• Sub-GHz, Add Manually, Nice Flo 12-bit_433, save file, load file, KEY should be 12-bits (3 digits) and YEK should be 12-bits. Writing out the binary for the KEY and reversing it should give you the YEK. Transmitting the signal should display matching KEY on second Flipper Zero.
• Sub-GHz, Add Manually, CAME 12-bit_433, save file, load file, KEY should be 12-bits (3 digits) and YEK should be 12-bits. Writing out the binary for the KEY and reversing it should give you the YEK. Transmitting the signal should display matching KEY on second Flipper Zero.

Checklist (For Reviewer)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[jamisonderek]

I was trying to also fix #3143 and it looks like that fix also became part of this fix because I was working in the same branch.

What's new

Adds support for pairing 850LM with Add Manually Security+2.0 entry.

Verification

Sub-GHz, Add Manually, Security+2.0, save file, load file. Press pair button on 850LM receiver. Press OK on Flipper, device should pair. Press OK on Flipper again, device relay should click.