Fix dynamicrules.cs

Author: sim0n00ps

OF DRM Video Downloader/Entities/DynamicRules.cs

@@ -12,6 +12,9 @@ public class DynamicRules
 		[JsonProperty(PropertyName = "app-token")]
 		public string? AppToken { get; set; }
 
+		[JsonProperty(PropertyName = "app_token")]
+		private string AppToken2 { set { AppToken = value; } }
+
 		[JsonProperty(PropertyName = "static_param")]
 		public string? StaticParam { get; set; }