Don't ignore tag clicks in the tooltips
Summary:
Now that we can use the metadata widgets in the tooltips, we can also
open the tags:// url if the user clicks some tag in a tooltip.
The behavior is now consistent with the metadata widget in the information panel.
Test Plan: Click a tag when the metadata tooltip shows up.
Reviewers: emmanuelp
Subscribers: Konqueror, Dolphin
Differential Revision: https://phabricator.kde.org/D5658