Incorrect behavior since PR#1365 was merged

[gmarcy]

Describe the bug

Ever since PR#1365 was merged my systems all boot into the interactive menu instead of using the boot filename returned from DHCP server. images were built w/ explicit

bootloader_tftp_enabled: false

To Reproduce
Steps to reproduce the behavior:

1. reboot a system using ipxe when dhcp returns a filename to use to boot. tftp-server is set to next-server here:

isset ${next-server} && isset ${proxydhcp/next-server} && goto choose-tftp || set tftp-server ${next-server} && goto load-custom-ipxe

2. since filename is set you always end up in tftpmenu

:load-custom-ipxe
isset ${tftp-server} && isset ${filename} && goto tftpmenu

3. tftpmenu never even uses filename, so will always end up here

chain --autofree tftp://${tftp-server}/menu.ipxe

Expected behavior

I expect it to use the filename I've configured dhcp to return and I expect it to use http on the server I've configured in the boot_domain rather then booting from the tftp server when I've disabled booting from tftp

Screenshots

Additional context