Correct formatting tabbed to single spacing for DataGridViewCellCancelEventHandler (#943)

Correct formatting tabbed to single spacing for DataGridViewCellCancelEventHandler Delegate snippet5to be consistent with rest of code.

Resolves dotnet/dotnet-api-docs#2508

Author: EugeneKramer

snippets/csharp/VS_Snippets_Winforms/System.Windows.Forms.DataGridView.RowOperations/CS/rowoperations.cs

@@ -279,7 +279,7 @@ private Boolean IsTrackGood(DataGridViewCell cell)
     {
         Int32 cellValueAsInt;
         if (cell.Value.ToString().Length == 0)
-		{
+        {
             cell.ErrorText = "Please enter a track";
             songsDataGridView.Rows[cell.RowIndex].ErrorText = 
                 "Please enter a track";
@@ -305,7 +305,7 @@ private Boolean IsTrackGood(DataGridViewCell cell)
     private Boolean IsDateGood(DataGridViewCell cell) 
     {
         if (cell.Value == null)
-		{
+        {
             cell.ErrorText = "Missing date";
             songsDataGridView.Rows[cell.RowIndex].ErrorText = 
                 "Missing date";
@@ -347,4 +347,4 @@ private void RemoveAnnotations(Object sender,
     }
     //</snippet10>
     #endregion
-}
+}