Fix leaking incorrect positions

It was only cleared when the previous one was canceled, not when it was directly replaced by the next one.

src/main/java/baritone/process/BuilderProcess.java

@@ -108,6 +108,7 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
         this.layer = Baritone.settings().startAtLayer.value;
         this.numRepeats = 0;
         this.observedCompleted = new LongOpenHashSet();
+        this.incorrectPositions = null;
     }
 
     public void resume() {