Fix rect calculation.

Not sure what the intended height is though. 16 or 17?

src/apps/workspaces/Workspaces.cpp

@@ -990,7 +990,7 @@ BView* instantiate_deskbar_item()
 	if (width > 129)
 		width = 129;
 
-	return new WorkspacesView(BRect (0, 0, width, height), false);
+	return new WorkspacesView(BRect (0, 0, width - 1, height - 1), false);
 }