Remove let-chain close brace check. #99731
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#98633 added some checks to forbid let-expressions that aren't in a let chain. This check looks at the preceding token to determine if it is a valid let-chain position. One of those tokens it checks is the close brace
}. However, to my understanding, it is not possible for a let chain to be preceded by a close brace. This PR removes the check to avoid any confusion.This is a followup to the discussion at #98633 (review). It wasn't clear what issues the original PR ran into, but I have run the full set of CI tests and nothing failed. I also can't conceive of a situation where this would be possible. This doesn't reject any valid code, I'm just removing it to avoid confusion to anyone looking at this code in the future.