Revert "change include in mod_monitor_web to web/ejabberd_http.hrl"

This reverts commit f356199082f158d9e39a4d58bb45a665b08aa5bb.
Revert "Revert "change include in mod_monitor_web to web/ejabberd_http.hrl""

This reverts commit e7e9671854e8fe1afb3bf3c1ae8de5bd9fdf6f27.