D12495: [Desktop Theme KCM] Workaround bug in FileDialog

[Kai Uwe Broulik]

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REVISION SUMMARY
  When `FileDialog` is created with `visible` set to `true` it will open the dialog immediately before its properties are set leading to a dialog with no title and filter.

TEST PLAN
  5.12 branch
  
  Opened dialog, verified title said "Open Theme" and file name filter was set
  `QtDialogs` is pretty much unmaintained and to be replaced by some platform import(?) so a qt bug report probably won't help

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D12495

AFFECTED FILES
  kcms/desktoptheme/package/contents/ui/main.qml

To: broulik, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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