Fix ConfigurePolledBno055 operation mode

- It was incorrectly configured in IMU mode (which only uses gyroscope and
  accelerometer). Now its correctly configured to use magnetometer in
  NDOF mode, which should reduce drift.

OpenEphys.Onix1/ConfigurePolledBno055.cs

@@ -119,7 +119,7 @@ void ConfigureBno055(DeviceContext device)
             i2c.WriteByte(0x3F, 0x00); // Internal oscillator
             i2c.WriteByte(0x41, (uint)AxisMap);  // Axis map config
             i2c.WriteByte(0x42, (uint)AxisSign); // Axis sign
-            i2c.WriteByte(0x3D, 8); // Operation mode is NOF
+            i2c.WriteByte(0x3D, 0x0C); // Operation mode is NOF
         }
     }