Show headers as empty if default

lib/screen_settings.dart

@@ -338,7 +338,11 @@ class _ScreenSettingsState extends State<ScreenSettings> {
                                         },
                                             validatorError:
                                                 AppLocalizations.of(context)!
-                                                    .settingsHostHeaderInvalid);
+                                                    .settingsHostHeaderInvalid,
+                                            prefill: !((prefs!.getString(
+                                                        "hostHeaders") ??
+                                                    {}) ==
+                                                "{}"));
                                         prefs!.setString("hostHeaders", tmp);
                                       },
                                       icon: const Icon(Icons.add_rounded)),

lib/worker/setter.dart

@@ -373,9 +373,11 @@ Future<String> prompt(BuildContext context,
     String? uuid,
     Future<bool> Function(String content)? validator,
     String? validatorError,
-    String? placeholder}) async {
+    String? placeholder,
+    bool prefill = true}) async {
   var returnText = (valueIfCanceled != null) ? valueIfCanceled : value;
-  final TextEditingController controller = TextEditingController(text: value);
+  final TextEditingController controller =
+      TextEditingController(text: prefill ? value : "");
   bool loading = false;
   String? error;
   await showModalBottomSheet(