Fix NonHierarchicalReferences shall be symetric
Fix NonHierarchicalReferences shall be symetric

See OPC UA Spec. Part 5, 1.04, Table 100.

JGrothoff/open62541,StalderT/open62541,JGrothoff/open62541,open62541/open62541,jpfr/open62541,jpfr/open62541,JGrothoff/open62541,StalderT/open62541,open62541/open62541,open62541/open62541,JGrothoff/open62541,StalderT/open62541,jpfr/open62541,StalderT/open62541,open62541/open62541,jpfr/open62541