lightning: fix a lightning config bug (#6484)#6486

ti-chi-bot merged 1 commit into

pingcap:release-5.0pingcap/docs-cn:release-5.0from

ti-chi-bot:cherry-pick-6484-to-release-5.0ti-chi-bot/docs-cn:cherry-pick-6484-to-release-5.0Copy head branch name to clipboard