small cleanup

Author: HaikAsatryan

src/GridifyExtensions/Models/AggregateQueryModel.cs

@@ -3,7 +3,6 @@
 namespace GridifyExtensions.Models;
 
 public class AggregateQueryModel : GridifyQueryModel
-
 {
    public required string PropertyName { get; set; }
    public required AggregateType AggregateType { get; set; }

src/GridifyExtensions/Models/FilterMapper.cs

@@ -6,8 +6,8 @@ namespace GridifyExtensions.Models;
 
 public class FilterMapper<T> : GridifyMapper<T>, IOrderThenBy
 {
-   internal const string Desc = " desc";
-   internal const string Separator = ", ";
+   private const string Desc = " desc";
+   private const string Separator = ", ";
    private readonly HashSet<string> _encryptedColumns = [];
 
    private string _defaultOrderExpression = string.Empty;