Ensure that new.* values of an UPDATE do not get clobbered after the

BEFORE triggers run when unmodified columns of the row being updated are
reloaded.  Fix for ticket [d85fffd6ffe856092ed8da]

FossilOrigin-Name: 0a514e62ad1ebe5c12da8daed429ae2f9d9910471d3c5cef3b6870bdadfefca1