Fix boolean setter declaration

Fix boolean setter declaration

BOOL_SETTER ignores given name and always sets value to the member
"parallel_aware". When inner_uniue comes after parallel_aware, the
former overrides the latter and the latter doesn't get the right
value.  As the result the following JSON plan is wrongly converted as
"Parallel Join".

select pg_store_plans_textplan('{"Plans":[{"Node Type":"Join","Parallel Aware":false,"Inner Unique":true}]}');

Currently only "Inner Unique" hits this.