'calculateLux' unexpected overflow behavior due to use of uint16_t

[atomdog]

• Arduino board: ESP32

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.16

• List the steps to reproduce the problem below: In dark conditions a call to apds.calculateLux inverts values and returns values at or near 65534. You can reproduced this via: uint16_t lux = apds.calculateLux(r, g, b); or uint32_t lux = apds.calculateLux(r, g, b);

  This is a straightforward fix and I can make a pull request if this repo is still being maintained.