Fix use of a static bitset to record whether items (in a dynamic vector) have been taken

src/game/boe.items.cpp

@@ -248,7 +248,7 @@ short dist_from_party(location where) {
 void set_item_flag(cItem* item) {
 	if((item->is_special > 0) && (item->is_special < 65)) {
 		item->is_special--;
-		univ.town->item_taken.set(item->is_special);
+		univ.town->set_item_taken(item->is_special);
 		item->is_special = 0;
 	}
 }

src/game/boe.town.cpp

@@ -383,7 +383,7 @@ void start_town_mode(short which_town, short entry_dir) {
 				continue;
 			}
 			// Don't place the item if the party already took it, unless it's always there
-			if(univ.town->item_taken[i] && !preset.always_there) {
+			if(univ.town->is_item_taken(i) && !preset.always_there) {
 				univ.town.items.pop_back();
 				continue;
 			}