Fix typography default style

Author: Nice3point

src/Wpf.Ui/Controls/TextBlock/TextBlock.cs

@@ -39,6 +39,12 @@ public class TextBlock : System.Windows.Controls.TextBlock
         )
     );
 
+    public TextBlock()
+    {
+        var defaultFontTypography = (FontTypography)FontTypographyProperty.DefaultMetadata.DefaultValue;
+        SetResourceReference(StyleProperty, defaultFontTypography.ToResourceValue());
+    }
+
     /// <summary>
     /// Gets or sets the <see cref="FontTypography"/> of the text.
     /// </summary>