Fix RadialGauge default template value formatting

This update fixes the `RadialGauge` value text formatting that was overridden by a template binding on the `Value` property.

Here's the appropriate text update location:

https://github.com/windows-toolkit/WindowsCommunityToolkit/blob/ef6527227539362125a0617d9b9821b2c009e11e/Microsoft.Toolkit.Uwp.UI.Controls/RadialGauge/RadialGauge.cs#L537

Author: jeromelaban

Microsoft.Toolkit.Uwp.UI.Controls/RadialGauge/RadialGauge.xaml

@@ -108,7 +108,6 @@
                                            FontSize="20"
                                            FontWeight="SemiBold"
                                            Foreground="{TemplateBinding Foreground}"
-                                           Text="{TemplateBinding Value}"
                                            TextAlignment="Center" />
                                 <TextBlock Margin="0"
                                            FontSize="16"