sink(ticdc): fix incorrect `default` field (#12038)#12054

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.1from ti-chi-bot:cherry-pick-12038-to-release-6.1

+6,237-3

Commits on Feb 8, 2025

This is an automated cherry-pick of pingcap#12038

wk989898
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