add 24px media-album-cover icon
Summary: media-album-cover icon is missing for the 24px size, create symlink to the amarok one like other sizes
Reviewers: Breeze, VDG, andreaska, andreask
Reviewed By: andreask
Subscribers: ngraham, Frameworks
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D10279