[Usability] Dialog "add transaction" remember last used "category" and "account" and use this as default when adding another transaction

[k3b]

as a : user
i want : use last used "category" and "account" as default when adding another transaction
so that : making it faster (less typing) to add similar transactions on same account/category

[k3b]

Hint you can use

        final SharedPreferences prefs = PreferenceManager
                .getDefaultSharedPreferences(this.getApplicationContext());
        lastCategoryId = prefs.getLong(KEY_LAST_USED_CATEGORY);

---

        SharedPreferences.Editor edit = PreferenceManager
                .getDefaultSharedPreferences(this.getApplicationContext()).edit();
        edit.putLong(KEY_LAST_USED_CATEGORY, lastCategoryId );
        edit.apply();