account-widget-irc: Call empathy_account_widget_changed when network combobox is changed
account-widget-irc: Call empathy_account_widget_changed when network combobox is changed

By calling this function we'll activate the connect button and record that the
widget contains pending changes (#606642).

Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets