refactor(pusub): Clean up UA_PubSubConnection_clear
refactor(pusub): Clean up UA_PubSubConnection_clear

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