ThinkNode M3 blue led stays enabled after transmission

blue (TX) led stays enabled for a long time and doesn't turn off as intended. When transmitting, led is blinking dark.

The problem seems to be related to an inverse led control signal. I generated a patch that fixed this issue for me.

[thinknode_m3_tx_led_fix.patch](https://github.com/user-attachments/files/29574992/thinknode_m3_tx_led_fix.patch)