Fixed: Add search by book title only

Close #2481

src/NzbDrone.Core/Indexers/Newznab/NewznabRequestGenerator.cs

@@ -77,6 +77,11 @@ namespace NzbDrone.Core.Indexers.Newznab
                     Settings.Categories,
                     "search",
                     $"&q={NewsnabifyTitle(searchCriteria.AuthorQuery)}+{NewsnabifyTitle(searchCriteria.BookQuery)}"));
+
+                pageableRequests.Add(GetPagedRequests(MaxPages,
+                    Settings.Categories,
+                    "search",
+                    $"&q={NewsnabifyTitle(searchCriteria.BookQuery)}"));
             }
 
             return pageableRequests;