[PWGDQ] Shifting CM frame of generated charmonia in pO

[mcoquet642]

No description provided.

[github-actions]

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[jackal1-66]

This change will apply to all simulations using GeneratorPromptCharmonia.C, not only in the pO system. Is this the right thing you need?

[mcoquet642]

This change will apply to all simulations using GeneratorPromptCharmonia.C, not only in the pO system. Is this the right thing you need?

I just corrected a mistake in my first commit. Now, these changes should only affect the classes O2_GeneratorParamJpsipp96TeV and O2_GeneratorParamPsipp96TeV, which are specifically aimed for pO, and should not affect other simulations using other classes. Thanks

[jackal1-66]

@lucamicheletti93 @iarsene could you please review this code?