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box: fix fuzzer UB report in xrow_decode

The `lsn` and `tsn` fields of `struct xrow_header` are signed. So UB on
their arithmetic is possible if fuzzer feeds really odd input into
`xrow_decode`. This is barely possible in practice but to silent fuzzer
let's do arithmetic in unsigned.

Closes #10578

NO_TEST=issue is not really possible, should be handled by fuzzer
NO_CHANGELOG=issue is not really possible
NO_DOC=bugfix

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