fix: Synology does not support HTTP DELETE for deleting files, but supports POST/GET

修复：群晖删除文件不支持 HTTP DELETE，支持 POST/GET

Author: aa2013

lib/src/client.dart

@@ -127,8 +127,8 @@ class Client {
   }
 
   /// Remove files
-  Future<void> removeAll(String path, [CancelToken? cancelToken]) async {
-    var resp = await this.c.wdDelete(this, path, cancelToken: cancelToken);
+  Future<void> removeAll(String path, [CancelToken? cancelToken, String? method]) async {
+    var resp = await this.c.wdDelete(this, path, cancelToken: cancelToken, method: method);
     if (resp.statusCode == 200 ||
         resp.statusCode == 204 ||
         resp.statusCode == 404) {

lib/src/webdav_dio.dart

@@ -202,8 +202,8 @@ class WdDio with DioMixin implements Dio {
 
   /// DELETE
   Future<Response> wdDelete(Client self, String path,
-      {CancelToken? cancelToken}) {
-    return this.req(self, 'DELETE', path, cancelToken: cancelToken);
+      {CancelToken? cancelToken, String? method}) {
+    return this.req(self, method ?? 'DELETE', path, cancelToken: cancelToken);
   }
 
   /// COPY OR MOVE