Use a better icon for recently accessed items in the Places Panel

The problem with the icon "package_utility_time" that has been used
before was that it is not available on all distros. The new icon
"actions/chronometer" should be available on every KDE install.

Thanks to Elias Probst for suggesting the new icon - I'm not that
familiar with the icons provided by KDE myself.

BUG: 304323
FIXED-IN: 4.9.1