fix: ensure configuration is flushed on enable change

lib/ui/desktop/ssl/ssl.dart

@@ -381,16 +381,10 @@ class _SwitchState extends State<_Switch> {
                     changed = true;
                     widget.onEnableChange(val);
                     CertificateManager.cleanCache();
+                    widget.proxyServer.configuration.flushConfig();
                     setState(() {});
                   }))
         ]));
   }
 
-  @override
-  void dispose() {
-    super.dispose();
-    if (changed) {
-      widget.proxyServer.configuration.flushConfig();
-    }
-  }
 }

lib/utils/desktop_support.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:proxypin/ui/configuration.dart';
+import 'package:proxypin/ui/desktop/window_listener.dart';
 import 'package:window_manager/window_manager.dart';
 
 import '../network/util/logger.dart';