Remove old references to png icons

2 jobs for master in 8 minutes and 56 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #45556
linux kf5-qt5 qt5.12

00:08:56

17.0%
failed #45557
windows
windows kf5-qt5 qt5.13

 
Name Stage Failure
failed
windows kf5-qt5 qt5.13 Build There has been a timeout failure or the job got stuck. Check your timeout limits or try again
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