Update dockwidgets features settings

def apply_panes_settings(self):
        """Update dockwidgets features settings"""
        for plugin in (self.widgetlist + self.thirdparty_plugins):
            features = plugin.FEATURES
            if CONF.get('main', 'vertical_dockwidget_titlebars'):
                features = features | QDockWidget.DockWidgetVerticalTitleBar
            plugin.dockwidget.setFeatures(features)
            plugin.update_margins()