tune appearance of all albums and all artists views
Summary:
remove extra margins in all artists view
squeeze a bit of space in both views
ensure more consistency in layout between both views
if possible use a light font for the artist in all albums view
Test Plan: to me looks better
Reviewers: Elisa, astippich, andreaska
Reviewed By: andreaska
Subscribers: andreaska, andreask
Differential Revision: https://phabricator.kde.org/D9596