Fix for field alternating row style in the move cell

This fixes the alternating row style; the move cell had a specific background colour, so it didn't look quite right.

Before:
![screen shot 2014-10-20 at 11 37 16](https://cloud.githubusercontent.com/assets/1231306/4704058/7a0569d2-586f-11e4-9fc7-e9878f43a2ba.png)

After:
![screen shot 2014-10-20 at 11 37 04](https://cloud.githubusercontent.com/assets/1231306/4704061/7dbe16d2-586f-11e4-9b5b-5f52c2ab729a.png)