configure neutrino interaction to produce only particles in C7 legacy mode

following the discussion from Baobiao Yue on mattermost https://mattermost.hzdr.de/corsika8/pl/41oesowttjfgtq57jec7q93etc

The first shower is coming from:
pdg=523  logE/eV =  14.94

The second shower is coming from:
pdg=5122   logE/eV = 14.73

2d ago
So the second shower is caused by BOTTOM BARYONS 5122 decay

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