Fix an object sanity check failure: a buried object with its bypass
bit set.
clear_bypasses() was supposed to be clearing the bypass bit on every
object but was neglecting the buried objects list and the billed
objects list (and inventory of the mydogs list, but that is expected
to always be empty at the time when clear_bypasses() gets called).
We already had an issue with billed objects, revealed by the fuzzer
soon after sanity checking was extended to test bypass/in_use/nomerge
bits. That one was fixed by clearing the bypass bit of specific
objects as they are being added to a shop bill. This fix should make
that earlier one become obsolete, but isn't removing it.
e6f1b5c0ce