mergestate: remove unrequired RECORD_RESOLVED_OTHER record
This was introduced in last cycle however while working on refactoring
mergestate, I realized it's unncessary.
This will break users who did a merge using previous version, did this kind of
storage and before commiting updated the mercurial version.
Differential Revision: https://phab.mercurial-scm.org/D8716
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"base": "hg:.^"
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