Fix G19 macro key handling on newer Linux systems

[MiQ71]

Problem

On Linux Mint 22 (Ubuntu 24.04 based), Logitech G19 macro keys only worked once after starting g19daemon.

The first key press was detected correctly, but subsequent G-key presses were ignored until the daemon was restarted.

Root Cause

The G19 macro interface (046d:c229) exposes endpoint 0x83 and produces additional 7-byte reports besides the actual macro key reports.

The current implementation uses a 4-byte buffer and does not correctly handle these additional reports.

Changes

• Increase gKeysBuffer from 4 to 7 bytes.
• Use endpoint 0x83 explicitly for the macro interface.
• Ignore non-macro reports (buffer[0] != 0x02).
• Re-submit transfers after ignored reports.
• Properly handle key release events.

Testing

Tested on:

• Linux Mint 22.3 (Zena)
• Logitech G19 (046d:c229)

Verified:

• G1-G12 work repeatedly.
• M1/M2/M3 profiles work correctly.
• Multiple consecutive key presses are detected reliably.
• Commands assigned to G-keys can be executed repeatedly without restarting the daemon.

Related

This appears to resolve the behavior originally reported in issue #33.

[qwertychouskie]

Apparently OP's account got automatically shadow banned on GitHub for a bit, but it's back now. Just posting this here to make sure it's known that this PR exists now that it's actually visible.