D9763: [Slideshow] Don't repeatedly restart on startup

[Kai Uwe Broulik]

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REVISION SUMMARY
  Wait for `m_ready` until doing anything. This keeps the slideshow from first showing the default wallpaper, then a random slideshow image, and then fade to the next slideshow image.

TEST PLAN
  - Switching slideshow wallpapers is still animated
  - clicking "Next wallpaper" in context menu still works
  - Copying a file to the picture folder will add it to the slideshow just fine
  
  Removed the `setSingleImage()` call in the constructor which would never do anything as it's guarded by `m_ready`

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D9763

AFFECTED FILES
  wallpapers/image/image.cpp

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