add param for dielectron OO cocktail based on pythia

[hscheid]

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[github-actions]

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[jackal1-66]

Ciao @hscheid, the failure is caused by another PR : #2023
This was merged three months ago, however I see now that the format of the decay table is wrong: a maximum of 6 characters after the comma is allowed for the branching ratio, while here 7 are provided. I tested it locally by removing the BR last character in each line and it is working. Could you please edit the table (a simple rounding is enough)? I think doing it in this PR directly would be beneficial so that you can test directly the external generator

[hscheid]

Hi @jackal1-66 thank you for checking this. Should be fixed with this commit. 22b1fb7