Don’t run make_lazy_default on KDE

Open Matthew Bauer requested to merge matthewbauer/xdg-utils:dont-make-lazy-on-kde into master

make_lazy_default tries to check what the default application is, but KDE has its own concept of default which may not match this. Skipping it here avoids annoyingly having KDE and xdg-utils become out-of-sync.

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