feat(webdav): 更新WebDav账户默认配置

entry/src/main/ets/dialog/WebDavAccountDialog.ets

@@ -26,11 +26,11 @@ export struct WebDavAccountDialog {
   onConfirm?: (account: WebDavAccount) => void;
   onCancel?: () => void;
   @State accountName: string = 'demo';
-  @State host: string = 'myhome.ss5.xyz';
+  @State host: string = '';
   @State port: number = 5005;
   @State filepath: string = '/';
-  @State username: string = 'chendeben';
-  @State password: string = 'chen384626WYT';
+  @State username: string = '';
+  @State password: string = '';
   @State enableHttps: boolean = false;
   @State coverPath: string = '';
   @State isDarkMode: boolean = false;