Change double-float precision in SumOfWeights histo

Giulia Di Gregoriorequested to merge
gdigrego/easyjet:main-gdigrego-SumOfWeightsHisto_Precision into main

Need to convert from float to double otherwise the SumOfWeights is different from the CutBookKeeper_*_NOSYS.

Tagging @tstreble , @lderamo

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