Fix deprecated code

With the upcoming FairRoot release the function FillEventHeader of the FairRootManager is deprecated, so use the function from FairSource directly. Fixes #2644.

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• 958af854 - fix

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Dear @n.herrmann, @i.deppner, @f.uhlig, @p.-a.loizeau,

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• 958af854...9321fa84 - 2 commits from branch computing:master
• b9b564df - Fix deprecated code
• 4cfdae6d - fix

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