Deskbar: Fix an edge case sizing bug

If you have no apps open because Tracker crashed and you opened a new team it
would size the expando menu bar incorrectly in vertical mode.

This fixes the problem.

src/apps/deskbar/ExpandoMenuBar.cpp

@@ -616,7 +616,7 @@ TExpandoMenuBar::AddTeam(BList* team, BBitmap* icon, char* name,
 
 	float itemWidth = -1.0f;
 	if (fVertical)
-		itemWidth = Frame().Width();
+		itemWidth = fBarView->Bounds().Width();
 	else {
 		itemWidth = iconSize;
 		if (!settings->hideLabels)