Fix water guard sleep tile (#209)

- Fixed: One of tiles for V13 water guard's sleep routine was out of range.

Fallout2/Fallout1in2/Mapper/source/scripts/00V13/WTRGRD.ssl

@@ -127,7 +127,7 @@ procedure critter_p_proc begin
             move_to(self_obj, 16912, 2);
          end
          else begin
-            self_walk_to_tile(self_obj);
+            self_walk_to_tile(16912);
          end
          asleep := 0;
       end