Add season number fallback for OMDB and TMDB plugins (#15113)

MediaBrowser.Providers/Plugins/Omdb/OmdbProvider.cs

@@ -138,6 +138,8 @@ namespace MediaBrowser.Providers.Plugins.Omdb
             }
 
             var item = itemResult.Item;
+            item.IndexNumber = episodeNumber;
+            item.ParentIndexNumber = seasonNumber;
 
             var seasonResult = await GetSeasonRootObject(seriesImdbId, seasonNumber, cancellationToken).ConfigureAwait(false);
 

MediaBrowser.Providers/Plugins/Tmdb/TV/TmdbEpisodeProvider.cs

@@ -177,8 +177,8 @@ namespace MediaBrowser.Providers.Plugins.Tmdb.TV
 
             var item = new Episode
             {
-                IndexNumber = info.IndexNumber,
-                ParentIndexNumber = info.ParentIndexNumber,
+                IndexNumber = episodeNumber,
+                ParentIndexNumber = seasonNumber,
                 IndexNumberEnd = info.IndexNumberEnd,
                 Name = episodeResult.Name,
                 PremiereDate = episodeResult.AirDate,