follow-up to bug 202131: BubbleSort is too slow. fixes an omission that was supposed to go in with the original patch.

p=neil, r=dwitte, sr=darin, a=sspitzer.

suite/common/permissions/treeUtils.js

@@ -160,7 +160,7 @@ function SortTree(tree, view, table, column, lastSortColumn, lastSortAscending,
 
   // display the results
   tree.treeBoxObject.invalidate();
-  if (selectedRow>0) {
+  if (selectedRow >= 0) {
     tree.treeBoxObject.ensureRowIsVisible(selectedRow)
   }