Fixed MPU6886 Init I2C error

Author: EeeeBin

src/utility/MPU6886.cpp

@@ -23,7 +23,7 @@ int MPU6886::Init(void) {
   Gyscale = GFS_2000DPS;
   Acscale = AFS_8G;
 
-  Wire1.begin(21,22);
+  Wire.begin(21,22);
 
   I2C_Read_NBytes(MPU6886_ADDRESS, MPU6886_WHOAMI, 1, tempdata);
   imuId = tempdata[0];