[sailfish-browser] Resuspend background view after page auto-refresh

Refresh timer created for meta-tags with http-equiv="refresh" keep working for inactive tabs too and are not supposed to be disabled. The problem is that triggered refresh timers run nsDocShell::LoadURI() method which activate a tab and then never deactivate it despite the fact that nsDocShell::mIsActive still keeps false value.

I guess it'd be safer for us to suspend reloaded tabs explicitly in UI-code.