ResourcePreviewer: disable journalling when previewing

Globally disable journalling when previewing a ResourceItem (i.e. load
a preset, sample etc.).

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

include/ResourcePreviewer.h

@@ -46,7 +46,7 @@ private:
 	{
 		virtual QString nodeName( void ) const
 		{
-			return( "PreviewTrackContainer" );
+			return "PreviewTrackContainer";
 		}
 	} ;