fix bug 1074254 - correlations on topcrasher page not working

r? @peterbe - a little gross but correlations needs "Windows NT" since that's what is in the correlations text files.

Should this be done elsewhere, maybe in the middleware service?

Regardless, returning platforms as a string is wrong, the model wants a ```list```.
Hah I was wondering that - I didn't dig into it but I bet the model changed.