Added filter row to "Location Summary" screen

prs.desktop/Panels/Products/Locations/StockHoldingGrid.cs

@@ -38,7 +38,7 @@ namespace PRSDesktop
         public StockHoldingGrid() : base()
         {
             ColumnsTag = "StockHolding";
-            Options.AddRange(DynamicGridOption.RecordCount, DynamicGridOption.SelectColumns);
+            Options.AddRange(DynamicGridOption.RecordCount, DynamicGridOption.SelectColumns, DynamicGridOption.FilterRows);
 
             ReceiveButton = AddButton("Receive", PRSDesktop.Resources.add.AsBitmapImage(), ReceiveStock);
             ReceiveButton.IsEnabled = false;