[orx-panel] Invoke requestRedraw from value setters

orx-jvm/orx-panel/src/main/kotlin/org/openrndr/panel/elements/ColorpickerButton.kt

@@ -19,6 +19,7 @@ class ColorpickerButton : Element(ElementType("colorpicker-button")), Disposable
         set(value) {
             if (value != field) {
                 field = value
+                requestRedraw()
                 events.valueChanged.trigger(ColorChangedEvent(this, value))
             }
         }

orx-jvm/orx-panel/src/main/kotlin/org/openrndr/panel/elements/XYPad.kt

@@ -56,6 +56,7 @@ class XYPad : Element(ElementType("xy-pad")) {
                     clamp(map(minX, maxX, -1.0, 1.0, newValue.x), -1.0, 1.0),
                     clamp(map(minY, maxY, -1.0, 1.0, newValue.y), -1.0, 1.0)
             )
+            requestRedraw()
         }
 
     init {