Remove public interface to set defaultPoints.

This will be set in the imported files.

src/main/java/net/themusicinnoise/vaccalc/PointEngine.java

@@ -9,8 +9,6 @@ public class PointEngine {
         defaultPoints = 1.0;
     }
 
-    public void setDefaultPoints(float defaultPoints) { this.defaultPoints = defaultPoints; }
-
     public double getPointsOfDay(LocalDate date) {
         return defaultPoints;
     }