Summary: Make the tooltip as compact as possible. This is also consistent with texts inside playerControlRow

Test Plan:
Before:
{F8092909}
After:
{F8092910}

Reviewers: #plasma, #vdg, ndavis, ngraham

Reviewed By: #vdg, ndavis, ngraham

Subscribers: ngraham, davidedmundson, ndavis, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D27262