Port KCM menu away from PlasmaComponents
Summary:
Plasma's menu can't handle being in a nested window and opens in the
wrong place.
Porting to QQC resolves this, and we ideally shouldn't be using this
import within a KCM.
BUG: 414762
Test Plan:
Opened menu
It was in the right place
Clicking on delete still worked
Reviewers: Plasma, jgrulich
Reviewed By: jgrulich
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D26382