Don't explicitly set raw event format in Tesla MC test

Alex Pearce requested to merge apearce-turbomc-rawevent into master

I think this was there because the job failed without it, and I figured the raw event was already split. After some semi-related testing elsewhere, I now realise that the errors are probably because of LHCb!1154 (merged). Will wait for this to run in the nightlies to confirm.

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