fix "nachweis löschen" on no color screen

verification/lib/home_page.dart

@@ -137,10 +137,6 @@ class _HomePageState extends State<HomePage> {
                                     ErrorColumn(
                                       'Heute ist keine Farbe vorhanden',
                                       actions: [
-                                        ElevatedButton(
-                                          onPressed: _onDeleteTicket,
-                                          child: const Text('Nachweis löschen'),
-                                        ),
                                         ElevatedButton(
                                           onPressed: () => showDialog(
                                               context: context,

verification/pubspec.yaml

 name: digital_3g
 description: A digital verification of having a valid 3G-Certificate for university
 publish_to: "none"
-version: 0.6.2+20
+version: 0.6.2+21
 
 environment:
   sdk: ">=2.12.0 <3.0.0"