feat: save the location to the directory when making it the default

Pressing d on a typed or aliased location set the favorite but never added it to wttrin-saved-locations, so the default persisted only as the favorite string, not as a named directory entry. The coordinate branch already saved. The typed/alias branch did not.

The typed/alias branch now puts the location into the directory before promoting it, so a typed default like "Reykjavik" persists as a ("Reykjavik" . "Reykjavik") entry. An empty-name coordinate detection still keeps the raw coordinates without saving an entry.

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