Fix internal temperature reading on ESP32 (#1391)

The previous macro used SENS_SAR_MEAS_WAIT2_REG to identify if we have the reading capability was not working, so replacing it by a fresh one NO_INT_TEMP_READING, defined as a negation due to the fact that most of the ESP32 supports internal temperature reading.

main/User_config.h

@@ -501,6 +501,7 @@ CRGB leds[FASTLED_IND_NUM_LEDS];
 //#  define TRIGGER_GPIO 14 // pin D5 as full reset button (long press >10s)
 #elif ESP32
 //#  define TRIGGER_GPIO 0 // boot button as full reset button (long press >10s)
+//#  define NO_INT_TEMP_READING true //Define if we don't want internal temperature reading for the ESP32
 #endif
 
 //      VCC   ------------D|-----------/\/\/\/\ -----------------  Arduino PIN