Represent enum parameters using the bar widget

The implementation of the current LADSPA dialog in master uses knobs to
represent enum parameters. Therefore it should also work with the new
bar widget.

This gets rid of many labels with the parameter name followed by
"(unsupported)".

plugins/LadspaEffect/LadspaWidgetFactory.cpp

@@ -61,6 +61,7 @@ QWidget * LadspaWidgetFactory::createWidget(LadspaControl * ladspaControl, QWidg
 	}
 
 	case INTEGER:
+	case ENUM:
 	case FLOATING:
 		// TODO Remove when not needed anymore
 		/*knob = new Knob(knobBright_26, parent, name);