BREAKING: Swap Wire1 and Wire in Adafruit Feather (#1468)

Fixes #1465

The Adafruit Feather came onboard before the Wire swapping was supported
in the core, so it's backwards from the real definition.  Now that swapping is
supported, fix it to match the rest of the boards.

Author: earlephilhower

variants/adafruit_feather/pins_arduino.h

@@ -30,10 +30,12 @@
 #define PIN_SPI1_SS    (31u)
 
 // Wire
-#define PIN_WIRE0_SDA  (24u)
-#define PIN_WIRE0_SCL  (25u)
-#define PIN_WIRE1_SDA  (2u)
-#define PIN_WIRE1_SCL  (3u)
+#define __WIRE0_DEVICE i2c1
+#define PIN_WIRE0_SDA  (2u)
+#define PIN_WIRE0_SCL  (3u)
+#define __WIRE1_DEVICE i2c0
+#define PIN_WIRE1_SDA  (24u)
+#define PIN_WIRE1_SCL  (25u)
 
 #define SERIAL_HOWMANY (2u)
 #define SPI_HOWMANY    (1u)