Cleanup

core/src/mindustry/ai/Pathfinder.java

@@ -468,7 +468,7 @@ public class Pathfinder implements Runnable{
         /** search frontier, these are Pos objects */
         IntQueue frontier = new IntQueue();
         /** all target positions; these positions have a cost of 0, and must be synchronized on! */
-        IntSeq targets = new IntSeq();
+        final IntSeq targets = new IntSeq();
         /** current search ID */
         int search = 1;
         /** last updated time */