fixed Wifi

wifi did not work because the path ""/sys/devices/virtual/net/" was wrong.
if fixed it to: "/sys/class/net/"

now wifi is working fine :)
![2014-02-19](https://f.cloud.github.com/assets/5022478/2210386/381a1a0e-9998-11e3-909e-34ce884053ad.png)