Reported by entrez: the code to have a hero become stunned for 1..3
turns when going though a level teleporter trap effectively negated
teleport control (except in wizard mode which is probably why this
slipped through). Make the effect happen after level_tele instead of
before, change it from being stunned to being confused, and only
happen if hero lacks teleport control.
The association between confusion and level teleportation already
exists and this might be just enough of a hint for someone who isn't
aware of that yet to figure it out. (Probably just wishing thinking.)
Magic portal traversal hasn't changed; it still causes brief stun.