fix: remove MenuIcon property from plugin configuration

Jellyfin.Plugin.Seasonals/SeasonalsPlugin.cs

@@ -230,7 +230,6 @@ public class SeasonalsPlugin : BasePlugin<PluginConfiguration>, IHasWebPages
             {
                 Name = Name,
                 EnableInMainMenu = true,
-                MenuIcon = "ac_unit",
                 EmbeddedResourcePath = string.Format(CultureInfo.InvariantCulture, "{0}.Configuration.configPage.html", GetType().Namespace)
             }
         };