Attempting to loot while suffering from confusion and not on top
of a container will drop gold if hero is carrying some, but it behaved
differently for GOLDOBJ config (gold dropped over a hole or down stairs
always stayed on current level) than for !GOLDOBJ (gold had a chance to
fall to lower level) when done at some location other than a throne.
This makes GOLDOBJ use dropx() instead of dropy(), same as !GOLDOBJ.
And with access to a throne it can be used to repeatedly summon
monsters until they're extinct. This makes it check for confusion before
finding containers, but the chest/exchequer code doesn't always kick in
so can't be attempted as many times before confusion expires, throttling
summoning a little. Also, when placing hero's gold into a chest, it now
clears the contents-known flag and relocks the chest.
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