Implement the suggestion that hero's current god not uncurse a worn helm
of opposite alignment when prayer result is fix-worst-cursed-item or
uncurse-all-cursed-items since doing so makes it easy for hero to switch
to another god. The second boon will still uncurse non-worn helms of
opposite alignment since that has no effect on how easy or hard it is
for the hero to change alignments. (The first boon only applies to worn
items plus luckstones and loadstones; non-worn helms aren't applicable.)
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