Change default url to sheetless.julian-mutter.de

lib/login_page.dart

@@ -16,7 +16,7 @@ class _LoginPageState extends State<LoginPage> {
   final log = Logger("_LoginPageState");
 
   final TextEditingController _urlController = TextEditingController(
-    text: "https://sheetable.julian-mutter.de",
+    text: "https://sheetless.julian-mutter.de",
   );
   final TextEditingController _usernameController = TextEditingController();
   final TextEditingController _passwordController = TextEditingController();
@@ -59,7 +59,10 @@ class _LoginPageState extends State<LoginPage> {
   }
 
   Future<void> _login(
-      String serverUrl, String username, String password) async {
+    String serverUrl,
+    String username,
+    String password,
+  ) async {
     setState(() {
       _error = null;
     });