duplicate line in ExecEvalJsonCoercionFinish

[jian he]

hi.

ExecEvalJsonCoercionFinish duplicate line:
        jsestate->escontext.error_occurred = false;
        jsestate->escontext.error_occurred = false;

https://git.postgresql.org/cgit/postgresql.git/tree/src/backend/executor/execExprInterp.c#n5230