Clip placeholder message within playlist

This fixes the text on the placeholder flooding out when playlist is hidden
1 job for !164 with work/clip_playlist_placeholder in 17 minutes and 25 seconds (queued for 4 minutes and 54 seconds)
detached
Status Job ID Name Coverage
  Build
passed #66946
linux kf5-qt5 qt5.12

00:17:25

86.0%