scene_output_layout: Don't destroy output when output layout is destroyed

There were a couple of problems with this:
1. The behavior is unexpected. Typically objects in wlroots won't
also destroy objects that they depend on. For instance, wlr_scene_output
will not destroy the wlr_output when it's destroyed. It shouldn't be any
different for scene layouts.
2. This fixes a crash where because wlr_output_layout and wlr_scene_output
are both addons to wlr_output, we might get into a situation where
wl_list_for_each_safe might malfunction. See [1]

This means that the compositor needs to manually destroy the output
when they destroy the layout, hence ~breaking. Compositors can just
call `wlr_scene_output_destroy()` if they want to destroy both at the
same time.

[1] https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4358#note_2106260

This reverts commit 1a731596c5bcd252d8796cacb59af8b20ceb914f.

Co-authored-by: Kirill Primak <vyivel@eclair.cafe>

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