use track as parent, correct initialization of m_enabledModel which fixes crashes on model-updates

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@816 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/effect_chain.cpp

@@ -29,14 +29,15 @@
 #include "effect_chain.h"
 #include "engine.h"
 #include "automatable_model_templates.h"
+#include "track.h"
 
 
 
 
 effectChain::effectChain( track * _track ) :
-	model( /*_track*/ NULL ),
+	model( _track ),
 	m_track( _track ),
-	m_enabledModel( FALSE, FALSE, TRUE )
+	m_enabledModel( FALSE )
 {
 }