Let flyers path over water and lava everywhere

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/orders.rs

@@ -97,7 +97,7 @@ impl Game {
         let mut n = 0;
         for (&j, &spot) in cands.iter().zip(spots.iter()).take(GUARDS) {
             let cur = self.ents[j].tile();
-            let Some(p) = self.map.path_to(cur, spot) else { continue };
+            let Some(p) = self.map.creature_path(flies(self.ents[j].kind), cur, spot) else { continue };
             let me = self.ents[j].id + 1;
             self.unreserve(me);
             self.map.t[spot].reserved = me;