[applets/taskmanager] Add a bit more padding around album/artist info in tooltip
Summary: Last visual change required to complete T12640: Refine Task Manager tooltips.
Test Plan:
Before:
After:
Reviewers: VDG, manueljlin, filipf
Reviewed By: VDG, filipf
Subscribers: ndavis, filipf, plasma-devel
Tags: Plasma
Maniphest Tasks: T12640
Differential Revision: https://phabricator.kde.org/D27303