Fixed a mistake in the demo plugin.

examples/audio plugin demo/Source/PluginEditor.cpp

@@ -28,7 +28,7 @@ public:
 
     void valueChanged() override
     {
-        param.setValue ((float) Slider::getValue());
+        param.setValueNotifyingHost ((float) Slider::getValue());
     }
 
     void timerCallback() override       { updateSliderPos(); }