8238968: Inconsisent formatting of Rectangle2D toString method

Reviewed-by: nlisker

Author: Lukasz Kostyra

modules/javafx.graphics/src/main/java/javafx/geometry/Rectangle2D.java

@@ -243,7 +243,7 @@ public boolean intersects(double x, double y, double w, double h) {
      * The returned string might be empty but cannot be {@code null}.
      */
     @Override public String toString() {
-        return "Rectangle2D [minX = " + minX
+        return "Rectangle2D [minX=" + minX
                 + ", minY=" + minY
                 + ", maxX=" + maxX
                 + ", maxY=" + maxY