bugfix lopy/pins_arduino.h (espressif#2135)

Correction of Pin A14 that was double defined.

Author: cyberman54

Diff for: variants/lopy/pins_arduino.h

@@ -50,7 +50,7 @@ static const uint8_t A11 = 0;
 static const uint8_t A12 = 2;
 static const uint8_t A13 = 15;
 static const uint8_t A14 = 13;
-static const uint8_t A14 = 12;
+static const uint8_t A15 = 12;
 static const uint8_t A16 = 14;
 static const uint8_t A17 = 27;
 static const uint8_t A18 = 25;