klipper: remove as operator to work around problematic generated QML code
Reason for the change
https://bugreports.qt.io/browse/QTBUG-119885
Test plan
Screenshots or screen recordings
Bugs fixed
BUG: 493038 FIXED-IN: 6.2.0
https://bugreports.qt.io/browse/QTBUG-119885
BUG: 493038 FIXED-IN: 6.2.0