Fix the OP_SeekRowid opcode so that it has no type-change side-effects on the

Fix the OP_SeekRowid opcode so that it has no type-change side-effects on the
key register in P3.  This fixes an obcure problem that arises when doing
equi-joins between a table with a TEXT column against another table with
an INTEGER PRIMARY KEY.  The original problem was discovered when OSSFuzz
created such a query and hit an assert() in OP_VerifyTabCol that was
specifically designed to catch these kinds of errors at run-time.

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