refactor(server): Simplify UA_Server_forEachChildNodeCall
refactor(server): Simplify UA_Server_forEachChildNodeCall

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