fixed variable order

Author: PilnyTomas

libraries/I2S/src/I2S.h

@@ -471,11 +471,11 @@ class I2SClass : public Stream
 
   int _deviceIndex;
   int _mclkPin;
+  int _inSdPin;
+  int _outSdPin;
   int _sckPin;
   int _fsPin;
   int _sdPin;
-  int _inSdPin;
-  int _outSdPin;
 
   i2s_state_t _state;
   int _bitsPerSample;