Change Installed list icon to view-list-details
Summary: The previous icon was the same, but it was blurry because it was only 16px
Test Plan:
Old:
New:
Reviewers: VDG, Discover Software Store, ngraham
Reviewed By: VDG, Discover Software Store, ngraham
Subscribers: ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D23678