trivial: debian/control: Add explicit depends on adduser
trivial: debian/control: Add explicit depends on adduser

W: fwupd: maintainer-script-needs-depends-on-adduser adduser (does not satisfy adduser) [postinst:91]

fwupd/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd