[#3854] Fix combo box update when preferences change

sflphone-client-gnome/src/actions.c

sflphone-client-gnome/src/config/addressbook-config.c

sflphone-client-gnome/src/config/audioconf.c

sflphone-client-gnome/src/contacts/addressbook.c

sflphone-client-gnome/src/contacts/searchbar.c

sflphone-client-gnome/src/contacts/searchbar.h

sflphone-client-gnome/src/mainwindow.c

sflphone-common/src/config/config.cpp