D11199: Don't show the built-in close button on ProceedDialogs

[Nathaniel Graham]

ngraham created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Don't show the Kirigami OverlaySheet's built-in close button, since we draw our own
  
  Depends on D11197 <https://phabricator.kde.org/D11197>

TEST PLAN
  F5747561: after 2.png <https://phabricator.kde.org/F5747561>

REPOSITORY
  R134 Discover Software Store

BRANCH
  no-close-button-on-proceed-dialog (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D11199

AFFECTED FILES
  discover/qml/DiscoverWindow.qml

To: ngraham
Cc: plasma-devel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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