Feat: Allow ESP32 light sleep when WiFi is inactive

[h3lix1]

Remove the HAS_WIFI compile-time wrapper from ESP32 PowerFSM light-sleep transitions. Boards without WiFi support can still use light sleep, while active WiFi remains a runtime blocker.

This includes a minor cleanup removing defined(MESHTASTIC_EXCLUDE_WIFI) from the if to include the header.

This leaves TRACKER and SENSOR roles alone, as they have their own sleep transitions.

This is part of the ESP32 Power Saving series of diffs.

🤝 Attestations

• I have tested that my proposed changes behave as described.
• I have tested that my proposed changes do not cause any obvious regressions on the following devices:
  • Heltec (Lora32) V3
  • LilyGo T-Deck
  • LilyGo T-Beam
  • RAK WisBlock 4631
  • Seeed Studio T-1000E tracker card
  • Other (please specify below)
    xiao wio esp32-s3

[Nevermore-42]

This would be very helpful, thanks!