Tracker: Fix double delete

fWidgetList is a BObjectList, the items are deleted when removed already so we
should not have the BObjectList delete them for us too. Instead, let's just turn
that off so we can delete the items ourselves one time.

src/kits/tracker/Pose.cpp

@@ -75,7 +75,7 @@ BPose::BPose(Model* model, BPoseView* view, uint32 clipboardMode,
 	bool selected)
 	:
 	fModel(model),
-	fWidgetList(4, true),
+	fWidgetList(4, false),
 	fClipboardMode(clipboardMode),
 	fPercent(-1),
 	fSelectionTime(0),