Bug#912304: Also needed kio-extras...

Looks like I also needed 'kio-extras' proper, not just 'kio-extras-data'.

Bug#912304: dolphin: Missing thumbnails/previews without kio-extras-data

Package: dolphin Version: 4:18.08.0-1 Severity: normal Dear Maintainer, 2-3 months ago thumbnails/previews were working fine (images had thumbnails, videos had thumbnails, etc.) in Dolphin. Then sometime in the past couple of weeks after the usual upgrade they just...stopped displaying. The P