plugin-list-box: Skip plugins with NoDisplay=true

Guido Güntherrequested to merge
guidog/phosh-mobile-settings:no-display into main

We don't want to show demo plugins to the user. We also might at some point have plugins that are always enabled. Hence add a way to hide those plugins in the UI.

Signed-off-by: Guido Günther agx@sigxcpu.org

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