Fix 'Connections' warnings in QML

[Konrad Materka]

Hi,

With Qt 5.15 we have tons of warnings like:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.

Qt 5.15 is now a minimum requirement for Plasma Workspace, so nothing is
blokcking to migrate to new syntax.

Is it OK to fix them in one massive MR or better to do that one by one (I
mean one applet/module at a time)?

-- 
Regards:
Konrad Materka
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