Delete not-implemented definition I2Cscan.

Author: aentinger

src/lib/display/Backlight.h

@@ -170,7 +170,6 @@ class Backlight
   void powerDown();
   void powerUp();
   void ledBlink(RGBColors color, uint32_t duration);
-  void I2Cscan();
   void writeByte(uint8_t address, uint8_t subAddress, uint8_t data);
   uint8_t readByte(uint8_t address, uint8_t subAddress);