Partial roll-up to reduce code divergence

Co-authored-by: rootdarkarchon <root.darkarchon@outlook.com>

MareSynchronos/WebAPI/Files/Models/DownloadFileTransfer.cs

@@ -18,5 +18,7 @@ public class DownloadFileTransfer : FileTransfer
         }
         get => Dto.Size;
     }
+
+    public long TotalRaw => 0; // XXX
     private DownloadFileDto Dto => (DownloadFileDto)TransferDto;
 }