Zabbix

..F....... [ZBX-23871] fixed incorrect order of "query_fields" and "headers" being sent to server in item test form

* commit '4d5937464a10a3ad8e50344e50fc395e6ed06539':
  ..F....... [ZBX-23871] simplified code
  ..F....... [ZBX-23871] minor code refactoring
  ..F....... [ZBX-23871] fixed incorrect order of "query_fields" and "headers" being sent to server in item test form