Live stream review comment fix + primary constructor (#3611)

src/MaterialDesignThemes.Wpf/RatingBarButton.cs

@@ -1,6 +1,6 @@
 namespace MaterialDesignThemes.Wpf;
 
-public class RatingBarButton : ButtonBase
+public class RatingBarButton(RatingBar ratingBar) : ButtonBase
 {
  static RatingBarButton()
  {
@@ -21,12 +21,10 @@ public int Value
  internal set => SetValue(ValuePropertyKey, value);
  }
 
- public RatingBar RatingBar { get; } = null!; // Null initializer added to suppress warning (for the obsoleted empty constructor)
-
- public RatingBarButton(RatingBar ratingBar) => RatingBar = ratingBar;
+ public RatingBar RatingBar { get; } = ratingBar;
 
  // Only added the default constructor for back-compat. Ideally should not be used from MDIX consumers, but you never know.
  [Obsolete("Should not be used. Use the constructor taking a RatingBar instance as parameter instead. This constructor will be removed in a future version.")]
- public RatingBarButton()
+ public RatingBarButton() : this(null!)
  { }
 }