kcm/qml: Fix non-scrollable Printer Settings page

Mike Noerequested to merge
work/noee/fix-settings-scroll into master

Use a scrollable ListView to display the printer markers.

Test: Install printer with many marker attributes (>15) or set the model to 20 and see the scroll bar appear and work.

FIXED-IN: 6.0.4

BUG: 484609

Edited by Mike Noe

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