more work on gtk & code cleanup

Pilz.Net.CloudProviders.Nextcloud/OCS/OcsApi.cs

@@ -13,7 +13,7 @@ public class OcsApi : IDisposable
     public event GetOcsApiAuthCredentailsEventHandler? GetOcsApiAuthCredentails;
 
     private readonly HttpClient client = new();
-    private readonly List<OcsApiBase> apis = new();
+    private readonly List<OcsApiBase> apis = [];
 
     public string BaseUrl { get; set; } = string.Empty;