Misc cleanup

core/src/mindustry/ai/BaseAI.java

@@ -32,7 +32,6 @@ public class BaseAI{
     private static final Seq<Tile> tmpTiles = new Seq<>();
 
     private static int correct = 0, incorrect = 0;
-    private static boolean anyDrills;
 
     private int lastX, lastY, lastW, lastH;
     private boolean triedWalls, foundPath;
@@ -228,7 +227,7 @@ public class BaseAI{
 
         //make sure at least X% of resource requirements are met
         correct = incorrect = 0;
-        anyDrills = false;
+        boolean anyDrills = false;
 
         if(part.required instanceof Item){
             for(Stile tile : result.tiles){