accountconfig: avoid duplication between dhtPort and DHT.port

daemon

src/app/currentaccount.cpp

src/app/currentaccount.h

src/app/net/jami/Constants/JamiStrings.qml

src/app/settingsview/components/AdvancedOpenDHTSettings.qml

src/libclient/accountmodel.cpp

src/libclient/api/account.h