output: only advertise current mode
output: only advertise current mode

- Regular clients shouldn't care about modes
- Modes exposed are missing metadata such as aspect-ratio, interleaved, etc
- Modes exposed cannot be pruned [1]
- wlr-output-management provides a better API for privileged clients

[1]: https://gitlab.freedesktop.org/wayland/wayland/issues/92

Closes: https://github.com/swaywm/wlroots/issues/1099

ascent12/wlroots,swaywm/wlroots,swaywm/wlroots,ascent12/wlroots,SirCmpwn/wlroots