Simplify: Move LoadChildrenFromNode into ActorFrame::LoadFromNode.

This also makes loading consistent between ActorFrame, ActorScroller and DActorScroller.
Previously, we ran ActorFrame::LoadFromNode before adding children, which caused InitCommand
to be run before adding children.

stepmania/src/ActorFrame.cpp

@@ -69,6 +69,9 @@ ActorFrame::ActorFrame( const ActorFrame &cpy ):
 
 void ActorFrame::LoadFromNode( const CString& sDir, const XNode* pNode )
 {
+	if( AutoLoadChildren() )
+		LoadChildrenFromNode( sDir, pNode );
+
 	Actor::LoadFromNode( sDir, pNode );
 
 	pNode->GetAttrValue( "UpdateRate", m_fUpdateRate );