Fix Heltec Wireless Paper LoRa reset pin

[robekl]

Summary

• set P_LORA_RESET to 12 for the Heltec Wireless Paper variant
• align the SX1262 reset wiring with Heltec's published Wireless Paper schematic
• leave the rest of the board definition unchanged

Why this is the right fix

Heltec's Wireless Paper schematic shows the LoRa control lines on the same GPIO8-14 pattern used by the other SX1262-based Heltec ESP32-S3 boards, including the reset line on GPIO12. MeshCore already passes P_LORA_RESET into the Wireless Paper radio Module constructor, so leaving this variant at RADIOLIB_NC treated that documented reset line as disconnected.

Setting P_LORA_RESET to 12 brings the board definition in line with the published hardware wiring without changing any other board-specific behavior.

Authoritative source:

• Heltec Wireless Paper schematic: https://resource.heltec.cn/download/Wireless_Paper/Wireless_Paper_V0.4_Schematic_Diagram.pdf

Validation

• built Heltec_Wireless_Paper_repeater successfully after the pin correction
• reviewed the Wireless Paper variant for other LoRa reset definitions and did not find additional board-specific references to update