From a bug report, kicking unpaid
food in a shop at a tameable monster resulting in taming the monster
without charging for the used-up food. This forces kicked objects that
are owned by shops to be put on the shop bill and flagged as unpaid, which
is normally reserved for carried items but makes kicked ones behave like
thrown ones. (If they land inside the shop without breaking, they're
removed from the bill.) So kicking food to make a pet now results in the
item being moved from the shop's unpaid bill to its used-up bill, same as
for thrown food. Although the latter kept billing consistent, it lacked
shop billing feedback; this fixes that too.
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