Data flow: Fix bad join

[hvitved]

#15599 follow-up.

Evaluated relational algebra for predicate _DataFlowImpl::Impl<HardcodedDataInterpretedAsCodeQuery::HardcodedDataInterpretedAsCodeFlow::C>::ret__#count_range@d112335l with tuple counts:
            285176  ~2%    {3} r1 = SCAN `_DataFlowDispatch::DataFlowCall.getEnclosingCallable/0#dispred#b7b78b19_DataFlowImpl::Impl<Hardcoded__#shared` OUTPUT In.1, In.0, In.2
        3265592261  ~3%    {5}    | JOIN WITH `DataFlowImpl::Impl<HardcodedDataInterpretedAsCodeQuery::HardcodedDataInterpretedAsCodeFlow::C>::returnCallEdge1/4#d02cae42_2301#join_rhs` ON FIRST 2 OUTPUT Lhs.0, Lhs.2, Rhs.2, Lhs.1, Rhs.3
             39070  ~8%    {6}    | JOIN WITH `DataFlowImplCommon::Cached::viableImplInCallContextExt/2#58e931ad` ON FIRST 3 OUTPUT Lhs.0, Lhs.3, Lhs.1, Lhs.2, Lhs.4, _
             39070  ~0%    {6}    | REWRITE WITH Out.5 := 1
                           return r1