Merge pull request #2720 from dkanada/music

Fix custom musicbrainz servers

(cherry picked from commit 8c8a396cd64db35d6b60ed3510edd8abdec9d973)
Signed-off-by: Joshua M. Boniface <joshua@boniface.me>

MediaBrowser.Providers/Plugins/MusicBrainz/Configuration/PluginConfiguration.cs

@@ -32,7 +32,11 @@ namespace MediaBrowser.Providers.Plugins.MusicBrainz
             {
                 if (value < Plugin.DefaultRateLimit && _server == Plugin.DefaultServer)
                 {
-                    RateLimit = Plugin.DefaultRateLimit;
+                    _rateLimit = Plugin.DefaultRateLimit;
+                }
+                else
+                {
+                    _rateLimit = value;
                 }
             }
         }