Cryptonight-FireIce\xmr-stak.exe cryptonightv7 not cryptonight_v7
There is wrong commandline for xmr-stak for AMD, cryptonightv7 not cryptonight_v7 like miner asks
![issue](https://user-images.githubusercontent.com/33821148/40578360-06e477ba-613d-11e8-983a-6f61a70e6fcd.png)
