trivial: debian: fix modules-load.d directory
trivial: debian: fix modules-load.d directory

Fixes: #2755

hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd