changed private -> public of checkRadius method

when i try to change color of forceField by using draw method , the Mindustry is crashed because of that private method.

core/src/mindustry/entities/abilities/ForceFieldAbility.java

@@ -94,7 +94,7 @@ public class ForceFieldAbility extends Ability{
         }
     }
 
-    private void checkRadius(Unit unit){
+    public void checkRadius(Unit unit){
         //timer2 is used to store radius scale as an effect
         realRad = radiusScale * radius;
     }