[branch-2.0](thrift) fix TLoadTxnBeginRequest backend_id's field no - #39821

[branch-2.0](thrift) fix TLoadTxnBeginRequest backend_id's field no#39821

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yujun777:branch-2.0-fix-TLoadTxnBeginRequestyujun777/doris:branch-2.0-fix-TLoadTxnBeginRequestCopy head branch name to clipboard