made default VST path to be inside LMMS working directory

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1577 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/config_mgr.cpp

@@ -68,7 +68,7 @@ configManager::configManager( void ) :
 #else
 	m_pluginDir( QString( PLUGIN_DIR ) ),
 #endif
-	m_vstDir( QDir::home().absolutePath() ),
+	m_vstDir( m_workingDir + "vst" + QDir::separator() ),
 	m_flDir( QDir::home().absolutePath() )
 {
 }