Update Wire.h

changed SDA/SCL pins to the ones that were default in construcor of Wire.cpp

Author: SamuelBrucksch

STM32F1/libraries/Wire/Wire.h

@@ -47,8 +47,8 @@
  * On the Maple, let the default pins be in the same location as the Arduino
  * pins
  */
-#define SDA 19
-#define SCL 20
+#define SDA PB7
+#define SCL PB6
 
 #define SOFT_STANDARD 27
 #define SOFT_FAST 0