Remove gpio 0 pinmode in analog sensor

Thanks to @tonilopezmr 
1c3d68af34

code/espurna/sensors/AnalogSensor.h

@@ -69,7 +69,6 @@ class AnalogSensor : public BaseSensor {
 
         // Initialization method, must be idempotent
         void begin() {
-            pinMode(0, INPUT);
             _ready = true;
         }