data: switch to images/pxeboot for Fedora ELN
Similar to commit c9eb52af Tested on https://odcs.fedoraproject.org/composes/production/latest-Fedora-ELN/compose/BaseOS/x86_64/iso/
Similar to commit c9eb52af Tested on https://odcs.fedoraproject.org/composes/production/latest-Fedora-ELN/compose/BaseOS/x86_64/iso/