output-layout: fix missing global for outputs with a custom mode

Before we were populating wlr_output.current_mode with a generated
fixed mode when a custom mode was committed in the DRM backend. But
that's no longer the case: now a custom mode behaves the same under
the DRM backend and other backends.

wlr_output_layout was still assuming that an output without a
current_mode was disabled. Fix that assumption.

Fixes: 5567aefb1c56 ("backend/drm: Don't add pollute fixed modes list with custom modes")
Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3743

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