If standing at the location of a closed door while having Passes_walls
ability, attemping to open that door with 'o' reported "you don't find
anything here to loot".
Using 'o' to loot for direction ./>/< is intentional but it ignored
the possibility of there also being a closed door present. When the
latter applies, only switch from open to loot for direction '>' so
that '.' (and '<') will open the door. Doesn't matter for creatures
that can ooze under a closed door--trying to use 'o' gets rejected for
them because they lack hands.
Also allow hero in Passes_walls form to use 'c' when at open door spot.
(For creatures that ooze under doors, 'c' is rejected just like 'o'.)
Unrelated: fix a typo in a recently added comment.
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