Fixed: Entity too large with big calibre library and digest authentication

Fixes #840

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

@@ -36,7 +36,7 @@ namespace NzbDrone.Core.Books.Calibre
 
     public class CalibreProxy : ICalibreProxy
     {
-        private const int PAGE_SIZE = 1000;
+        private const int PAGE_SIZE = 750;
 
         private readonly IHttpClient _httpClient;
         private readonly IMapCoversToLocal _mediaCoverService;