FIX: wifite error from nethunter-app

This should fix wifite "missing iw" when starting from nethunter-app:

https://github.com/offensive-security/nethunter-app/issues/17#issuecomment-68331453

Tested on 1+1 and working; used previous wifite startup script and also call ifconfig wlan1 up.

Signed-off-by: binkybear <binkybear@nethunter.com>