ensure_core_profiles() was unconditionally backfilling home/work/away
into the in-memory config on every load, even when the user had
already defined their own profiles (e.g. Home/Away/School). This
showed up as duplicate/phantom lowercase entries in `breadcrumbs
profile list`, and downstream in breadbar and bos-settings.
Now the self-heal only fires when the profile set is completely
empty (a genuinely fresh or corrupted config), never padding an
existing customized set.
b786060517