moved provider selection popup menu to be at the top of the main window

for now, i just removed the label that was in its place. i never found the label status to be very useful anyway.
not so. the comment and function name are pretty clear:

    def _set_label_offline(self):
        """
        Set the login label to reflect offline status.
        """
        # TODO: figure out what widget to use for this. Maybe the window title?