Update Jellyfin.Api/Controllers/PluginsController.cs

Co-authored-by: Cody Robibero <cody@robibe.ro>

Jellyfin.Api/Controllers/PluginsController.cs

@@ -219,7 +219,7 @@ namespace Jellyfin.Api.Controllers
 
             if (plugin != null)
             {
-                _installationManager.UninstallPlugin(plugin!);
+                _installationManager.UninstallPlugin(plugin);
                 return NoContent();
             }