Revert "[showdesktop][minimizeall] Reduce the maximum panel icon size"
I think I did this change the wrong way. What we really need is a way to use different sizes for different panel widgets by default without making it impossible for users to configure the size.
Reviewed By: Plasma, davidedmundson
Subscribers: davidedmundson, filipf, plasma-devel
Differential Revision: https://phabricator.kde.org/D22359