Fix boot section of fedora

Fixes could not boot issue reported by
https://github.com/netbootxyz/netboot.xyz/issues/1300

roles/netbootxyz/templates/menu/fedora.ipxe.j2

@@ -70,7 +70,7 @@ set params inst.ks=${ks_url} ||
 clear bt
 goto boottype
 
-:boot
+:bootos_images
 imgfree
 kernel ${fedora_mirror}/${dir}/images/pxeboot/vmlinuz inst.repo=${fedora_mirror}/${dir} ${install_mode} ${params} ${ipparam} {{ kernel_params }}
 initrd ${fedora_mirror}/${dir}/images/pxeboot/initrd.img