Thrown items and unidentified wands/staffs don't always target the tile displayed on screen

[nstoddard]

To reproduce:

• Comment out RogueMain.c line 523 (identify(theItem);) which will make wands of plenty unidentified in wizard mode
• Start a game in wizard mode, and get to a position a knight's move away from a monster
• Target the unidentified wand of plenty a tile behind the monster:

• Fire the wand; it will fire at a path that doesn't actually hit the monster:

This issue isn't specific to wands of plenty; it also happens with (at least) wands of domination and beckoning. I haven't tested others.

Edit: this also applies to unidentified staffs, and thrown items.