[rekonq] Favicon

[Lionel Chauvin]

> Something I noticed is, that if the favicon of a website is not displayed
> after loading it, reloading that website makes the favicon appear. This
> reliably works here on the latest git rekonq

Yes, but not for all websites. For me, it doesn't work at all with 
www.google.com.
Anyway, I fear that QWebSettings::iconForUrl() return only cached icons. So, 
for Wikipedia and Google search contextual actions, icons will not be 
displayed  the first time.