修复个人微信在群里@人，at_list为空的问题

Author: smallevilbeast

libs/WxWorkHelper_3.0.14.1205.dll

@@ -185,7 +185,7 @@ def manager_wxwork_by_pid(self, wxwork_pid):
         return self.WXLOADER.InjectWxWorkPid(wxwork_pid, c_string(self.wxhelper_dll_path))
 
     @REQUIRE_WXLOADER()
-    def close_manager():
+    def close_manager(self):
         return self.WXLOADER.DestroyWxWork()
 
     @REQUIRE_WXLOADER()