Don't show the built-in close button on ProceedDialogs
Summary:
Don't show the Kirigami OverlaySheet's built-in close button, since we draw our own
Depends on D11197
Test Plan:
Reviewers: apol, Discover Software Store
Reviewed By: apol, Discover Software Store
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11199