Fixed: Send primary series to Calibre

Fixes #1419

src/NzbDrone.Core/Books/Calibre/CalibreProxy.cs

@@ -214,7 +214,7 @@ namespace NzbDrone.Core.Books.Calibre
         {
             var edition = file.Edition.Value;
             var book = edition.Book.Value;
-            var serieslink = book.SeriesLinks.Value.FirstOrDefault(x => x.Series.Value.Title.IsNotNullOrWhiteSpace());
+            var serieslink = book.SeriesLinks.Value.OrderBy(x => x.SeriesPosition).FirstOrDefault(x => x.Series.Value.Title.IsNotNullOrWhiteSpace());
 
             var series = serieslink?.Series.Value;
             double? seriesIndex = null;

src/NzbDrone.Core/MediaFiles/EbookTagService.cs

@@ -200,7 +200,7 @@ namespace NzbDrone.Core.MediaFiles
             {
                 var edition = file.Edition.Value;
                 var book = edition.Book.Value;
-                var serieslink = book.SeriesLinks.Value.FirstOrDefault(x => x.Series.Value.Title.IsNotNullOrWhiteSpace());
+                var serieslink = book.SeriesLinks.Value.OrderBy(x => x.SeriesPosition).FirstOrDefault(x => x.Series.Value.Title.IsNotNullOrWhiteSpace());
 
                 var series = serieslink?.Series.Value;
                 double? seriesIndex = null;