feat: config: Move MakeNewSectorForDeals config into the Sealing sectoin

[magik6k]

Proposed Changes

This PR moves MakeNewSectorForDeals into the Sealing section of the config:

• Dealmaking section is mostly about market side of things, and may even be removed at some point when markets get replaced with boost
• MakeNewSectorForDeals doesn't really have anything to do with markets

This technically is a breaking change, but it's probably fine to just ship this given that this config wasn't present in any release where it would be actually useful, plus it should be very easy to notice that it has stopped working in case it was used.

Checklist

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• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <area>: <change being made>
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• This PR has tests for new functionality or change in behaviour
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