fix: missing public constructor

Author: Denny09310

src/ElectronNET.API/API/Entities/TitleBarOverlay.cs

@@ -4,7 +4,11 @@ public class TitleBarOverlay
 {
     private readonly bool? _value;
 
-    private TitleBarOverlay(bool value) => _value = value;
+    public TitleBarOverlay()
+    {
+    }
+
+    private TitleBarOverlay(bool value) : this() => _value = value;
 
     public string Color { get; set; }
 
@@ -15,4 +19,4 @@ public class TitleBarOverlay
     public static implicit operator bool?(TitleBarOverlay titleBarOverlay) => titleBarOverlay?._value;
 
     public static implicit operator TitleBarOverlay(bool value) => new(value);
-}
+}