prepo: Resolve JSON parsing issues in prepo report handling (#1022)

It seems MsgPack.Cli incorrectly converts some unicode control characters directly to JSON literal Unicode strings (eg. '\1'). As these are invalid, pretty printing the JSON report fails.

This removes pretty printing, pending a proper implementation, and tidies up MsgPack deserialization.

Ryujinx.HLE/HOS/Services/Prepo/IPrepoService.cs

@@ -1,3 +1,4 @@
+using MsgPack;
 using MsgPack.Serialization;
 using Ryujinx.Common;
 using Ryujinx.Common.Logging;
@@ -83,35 +84,21 @@ namespace Ryujinx.HLE.HOS.Services.Prepo
 
         private string ReadReportBuffer(byte[] buffer, string room, UserId userId)
         {
-            StringBuilder sb = new StringBuilder();
+            StringBuilder     builder = new StringBuilder();
+            MessagePackObject deserializedReport = MessagePackSerializer.UnpackMessagePackObject(buffer);
 
-            sb.AppendLine();
-            sb.AppendLine("PlayReport log:");
+            builder.AppendLine();
+            builder.AppendLine("PlayReport log:");
 
             if (!userId.IsNull)
             {
-                sb.AppendLine($" UserId: {userId.ToString()}");
+                builder.AppendLine($" UserId: {userId.ToString()}");
             }
 
-            sb.AppendLine($" Room: {room}");
+            builder.AppendLine($" Room: {room}");
+            builder.AppendLine($" Report: {deserializedReport}");
 
-            var    deserializedReport = Deserialize<dynamic>(buffer);
-            string jsonReport         = Encoding.ASCII.GetString(JsonSerializer.PrettyPrintByteArray(Encoding.UTF8.GetBytes(deserializedReport.ToString())));
-
-            sb.AppendLine($" Report:");
-            sb.AppendLine(jsonReport);
-
-            return sb.ToString();
-        }
-
-        private static T Deserialize<T>(byte[] bytes)
-        {
-            MessagePackSerializer serializer = MessagePackSerializer.Get<T>();
-
-            using (MemoryStream byteStream = new MemoryStream(bytes))
-            {
-                return (T)serializer.Unpack(byteStream);
-            }
+            return builder.ToString();
         }
     }
 }