Lexer: Alternate Layout Rule injects actual not virtual braces

When the alternate layout rule is activated via a pragma, it injects
tokens for { and } to make sure that the source is parsed properly.

But it injects ITocurly and ITccurly, rather than their virtual
counterparts ITvocurly and ITvccurly.

This causes problems for ghc-exactprint, which tries to print these.

Likewise, any injected ITsemi should have a zero-width SrcSpan.

Test case (the existing T13087.hs)

    {-# LANGUAGE AlternativeLayoutRule #-}
    {-# LANGUAGE LambdaCase            #-}

    isOne :: Int -> Bool
    isOne = \case 1 -> True
                  _ -> False

    main = return ()

Closes #16279

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