validate: use DDE for deepin desktop
Since DDE (and its distro 'deepin') v23 beta, 'DDE' will be used instead of 'Deepin', so we just also update the name here.
Related links:
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Since DDE (and its distro 'deepin') v23 beta, 'DDE' will be used instead of 'Deepin', so we just also update the name here.
Related links: