Pythia8_i: fix W- resonance scale setting for alternative bb4l+Py8 matching sample

Katharina Vossrequested to merge
katharin/athena:py8_bb4l_userhook_fix into main

Small bug fix concerning the setting of the resonance scale of the W- (for bb4l-sl sample). This scale was previously not set in scaleResonance for the W- due to a typo. This setting is only needed for the alternative bb4l-sl+Py8 matching sample.

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