DEBUG_SERIAL decimal address printed as hex

[disq]

#ifdef DEBUG_SERIAL
  DEBUG_SERIAL.print(F("Address 0x"));
  DEBUG_SERIAL.print(_addr);
#endif

_addr is printed as decimal, so for example a failing LIS3DH init shows as "Address 0x24 Not detected" where it's actually 0x18 (or, just 24)

https://github.com/adafruit/Adafruit_BusIO/blob/1.16.0/Adafruit_I2CDevice.cpp#L72