Money has no owner - unlike a dropped item it can be picked up by anyone
standing on it. Deriving the drop's shares from the killer's party made a
stranger's pick up pay nothing and leave the money on the ground, destroying
zen that was previously taken and split by the picking party.
The recorded shares now apply only when the party picking the money up is the
one which earned it; otherwise there is no experience of theirs to follow and
the money is split equally between the picking party, as it was before and as
share-less money (e.g. from an item box) already is.
Covered by DroppedMoneyTest.StrangerPartySplitsPickedUpMoneyEquallyAsync and
EarningPartyReceivesMoneyByExperienceShareAsync.
(cherry picked from commit ae7cad81da6893cfbd1c28bb29811b7f0a10d540)
