GDesktopAppInfo: fix default app logic
We use "tweaks" structures to track how a particular directory impacts the list of added, removed and default applications. We maintain this set of tweaks for each directory, in a hash table, keyed by unaliased mime type name, in order to facilitate fast lookups. A typo in the logic for creating and maintaining the uniqueness of these structures was causing the default app to be selected incorrectly from time to time. Fix that.
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