do not show selection checkmark for uno

Author: w-ahmad

src/TableViewHeaderRow.cs

@@ -362,11 +362,14 @@ internal void SetCornerButtonState()
     {
         var stateName = VisualStates.StateNoButton;
 
+#if WINDOWS
         if (TableView is ListView { SelectionMode: ListViewSelectionMode.Multiple })
         {
             stateName = TableView.IsEditing ? VisualStates.StateSelectAllCheckBoxDisabled : VisualStates.StateSelectAllCheckBox;
         }
-        else if (TableView is { CornerButtonMode: TableViewCornerButtonMode.Options })
+        else  
+#endif
+        if (TableView is { CornerButtonMode: TableViewCornerButtonMode.Options })
         {
             stateName = TableView.IsEditing ? VisualStates.StateOptionsButtonDisabled : VisualStates.StateOptionsButton;
         }

src/TableViewRow.cs

@@ -83,11 +83,6 @@ private bool IsContextRequestedFromCell(Windows.Foundation.Point position)
 #if WINDOWS
     private void OnIsSelectedChanged()
     {
-#else
-    protected override void OnIsSelectedChanged()
-    {
-        base.OnIsSelectedChanged();
-#endif
         DispatcherQueue.TryEnqueue(() =>
         {
             if (IsSelected && TableView?.SelectionMode is not ListViewSelectionMode.Multiple)
@@ -113,6 +108,7 @@ protected override void OnIsSelectedChanged()
             }
         });
     }
+#endif
 
     /// <summary>
     /// Handles the Foreground property changed.
@@ -503,12 +499,14 @@ internal void EnsureGridLines()
     /// </summary>
     internal void EnsureLayout()
     {
+#if WINDOWS
         if (CellPresenter is not null && TableView is not null)
         {
             CellPresenter.Padding = ((ListView)TableView).SelectionMode is ListViewSelectionMode.Multiple
                                      ? new Thickness(16, 0, 16, 0)
                                      : new Thickness(20, 0, 16, 0);
-        }
+        }  
+#endif
     }
 
     /// <summary>