New: Add FileId to History data for import events

(cherry picked from commit 952a7248c962908fc5da92762507421923a06e17)

Closes #1961

src/NzbDrone.Core/History/EntityHistoryService.cs

@@ -236,8 +236,7 @@ namespace NzbDrone.Core.History
                     DownloadId = downloadId
                 };
 
-                // Won't have a value since we publish this event before saving to DB.
+                history.Data.Add("FileId", message.ImportedTrack.Id.ToString());
-                // history.Data.Add("FileId", message.ImportedEpisode.Id.ToString());
                 history.Data.Add("DroppedPath", message.TrackInfo.Path);
                 history.Data.Add("ImportedPath", message.ImportedTrack.Path);
                 history.Data.Add("DownloadClient", message.DownloadClientInfo?.Name);