Avoid dealing with hidingTimer when not necessary
Avoid dealing with hidingTimer when not necessary

Navigation methods of the WebView will trigger loadingChanged
signal. Since we already control the timer when the loading changes,
we don't need to do it when calling navigation methods.

Reviewed-by: Rafael Brandão

snowshoe/snowshoe,snowshoe/snowshoe,qtproject/qt-apps-snowshoe,snowshoe/snowshoe,qtproject/qt-apps-snowshoe,qtproject/qt-apps-snowshoe