Table AM callback table_complete_speculative()'s succeeded argumentis reversed

The 'succeeded' argument seems backwards here:

> static void
> heapam_tuple_complete_speculative(Relation relation, TupleTableSlot *slot,
>                                   uint32 spekToken, bool succeeded)
> {
>     bool        shouldFree = true;
>     HeapTuple    tuple = ExecFetchSlotHeapTuple(slot, true, &shouldFree);
> 
>     /* adjust the tuple's state accordingly */
>     if (!succeeded)
>         heap_finish_speculative(relation, &slot->tts_tid);
>     else
>         heap_abort_speculative(relation, &slot->tts_tid);
> 
>     if (shouldFree)
>         pfree(tuple);
> }

According to the comments, if "succeeded = true", the insertion is 
completed, and otherwise it's killed. It works, because the only caller 
is also passing the argument wrong.

Barring objections, I'll push the attached patch to fix that.

- Heikki