[Widget Explorer] Continue using a trash can icon for "Uninstallable" category

Authored by ngraham on Apr 17 2019, 5:06 PM.

Description

[Widget Explorer] Continue using a trash can icon for "Uninstallable" category

Summary:
After D20623, some icons change a bit. This patch keeps the delegate using a trash can
icon, and it's more semantically correct as well to use edit-delete over list-remove

Test Plan:

Reviewers: broulik

Reviewed By: broulik

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D20637