Fixed alpha tracking when no ab test

We we're only adding the 'alpha' tracking to prop51 if the user was in an ab test

Obviously not right, now we add the alpha tracking regardless

Horrible diff, but basically removes the enclosing conditional

![1276852649_chilling-sloth](https://f.cloud.github.com/assets/74132/2196664/90c4104c-98b2-11e3-9854-38fe7a6b9006.gif)