The node attribue scratchpad_state is not in sway

[sophacles]

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The attr scratchpad_state is not present in ipc output of sway. It's unclear if it ever was there, but the last occurance of the string scratchpad_state in the sway repo was removed in this commit:

https://github.com/swaywm/sway/commit/a6bc46eea9d7dec6a2b93f85bac2e3737e0c6725

The attribute should probably be gated the sway feature flag.

[sophacles]

@leshow Im working on getting a project I have to work with sway as well as i3, I'm fine putting up a PR for this. I presume similar things may be discovered over the next few days as I work on it. Would you prefer if I make this ticket a general "sway differences" ticket or do a separate one (and pr) for each?

(I'm happy to do this work either way though :) )

[leshow]

Hey! Yes, I'd prefer it all in one PR. Feature gating the sway fields sounds good!