kcms/soundtheme: Apply theme on double click

Kai Uwe Broulikrequested to merge
work/kbroulik/sound-apply-dblclick into master
  • kcms/soundtheme: Apply theme on double click

Do what the other GridView KCMs do.

Reason for the change

I can double click to change icon themes, so I should be able to change sound themes like this, too.

@iasensio

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