StyleUtil: fix bindings created in toUnboxedDoubleArray must listen t…

…o changes of the source

chartfx-chart/src/main/java/io/fair_acc/chartfx/ui/css/StyleUtil.java

@@ -202,7 +202,7 @@ public static ObjectBinding<double[]> toUnboxedDoubleArray(ReadOnlyProperty<Numb
                 result[i] = array[i] == null ? 0 : array[i].doubleValue();
             }
             return result;
-        });
+        }, source);
     }
 
     public static void copyLineDashes(final GraphicsContext gc, Shape style) {