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Change DAOD Splitlevel to 0

Martin Errenst requested to merge merrenst/athena:master_change_DAOD_Splitlevel into master

Similar to !31063 (merged)

In my qualification task study I found that a default Splitlevel of 0 for derivations is better in terms of reading speeds and file sizes: https://cds.cern.ch/record/2654407

This 2 line MR should make some derivations (mostly smaller formats) a couple % smaller.

I don't want to sweep to 21.2 this time, because we might want to discuss it in AMG or SPOT before it goes in production.

Mentioning potentially interested people: @gemmeren, @elmsheus, @akraszna, @amete @egramsta, @guirriec, @boeriu

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