fix #K3895 - 'o' at own spot during pass-walls

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.

src/lock.c

@@ -794,8 +794,9 @@ doopen_indir(coordxy x, coordxy y)
         return ECMD_OK;
     }
 
-    /* open at yourself/up/down */
-    if (u_at(cc.x, cc.y))
+    /* open at yourself/up/down: switch to loot unless there is a closed
+       door here (possible with Passes_walls) and direction isn't 'down' */
+    if (u_at(cc.x, cc.y) && (u.dz > 0 || !closed_door(u.ux, u.uy)))
         return doloot();
 
     /* this used to be done prior to get_adjacent_loc() but doing so was
@@ -958,7 +959,7 @@ doclose(void)
 
     x = u.ux + u.dx;
     y = u.uy + u.dy;
-    if (u_at(x, y)) {
+    if (u_at(x, y) && !Passes_walls) {
         You("are in the way!");
         return ECMD_TIME;
     }

src/trap.c

@@ -6162,7 +6162,7 @@ lava_effects(void)
         iflags.in_lava_effects--;
 
         /*
-         * 3.7: this used to be uncondtional "back on solid <surface>"
+         * 3.7: this used to be unconditional "back on solid <surface>"
          * but surface() could return a lot of things where that ends up
          * sounding silly.  Deal with water, ignore furniture; assume
          * surface types 'air' and 'cloud' won't be present on same level