Fix determining of scripted effect config from KPluginSelector

Merged Alexander Lohnau requested to merge work/fix_kpluginselector_kcm_keyword into master

In the KPluginSelector we don't have the possibility to set the args for each KCM. Because of that we use the metadata of the KPluginFactory as a fallback to read the plugin keyword, which specifies the KCM we want to display.

This requires kcmutils 54b196a9bad88732debe0b49111af4755268f09f, which landed in the last release.

BUG: 445667

@nicolasfella @vladz

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