fix: fix redundant buttons on dialog

Signed-off-by: validcube <pun.butrach@gmail.com>

lib/services/patcher_api.dart

@@ -335,7 +335,8 @@ class PatcherAPI {
                       Navigator.pop(context);
                     },
                     child: I18nText('cancelButton'),
-                  ),
+                  )
+                else
                   TextButton(
                     onPressed: () {
                       Navigator.pop(context);