sensor/ads1x15: fix changing sensor type when reading adc

code/espurna/sensors/EmonADS1X15Sensor.h

@@ -327,7 +327,7 @@ class EmonADS1X15Sensor : public EmonSensor {
         unsigned int readADC(unsigned char channel) {
             UNUSED(channel);
             unsigned int value = i2c_read_uint16(_address, ADS1X15_REG_POINTER_CONVERT);
-            if (_type = ADS1X15_CHIP_ADS1015) value >>= ADS1015_BIT_SHIFT;
+            if (_type == ADS1X15_CHIP_ADS1015) value >>= ADS1015_BIT_SHIFT;
             delayMicroseconds(500);
             return value;
         }