Change visibility of ArtistSearchCommand and ArtistSearchService due to test build error

src/NzbDrone.Core/IndexerSearch/ArtistSearchCommand.cs

@@ -2,7 +2,7 @@
 
 namespace NzbDrone.Core.IndexerSearch
 {
-    class ArtistSearchCommand : Command
+    public class ArtistSearchCommand : Command
     {
         public int ArtistId { get; set; }
 

src/NzbDrone.Core/IndexerSearch/ArtistSearchService.cs

@@ -5,7 +5,7 @@ using NzbDrone.Core.Messaging.Commands;
 
 namespace NzbDrone.Core.IndexerSearch
 {
-    class ArtistSearchService : IExecute<ArtistSearchCommand>
+    public class ArtistSearchService : IExecute<ArtistSearchCommand>
     {
         private readonly ISearchForNzb _nzbSearchService;
         private readonly IProcessDownloadDecisions _processDownloadDecisions;