refactor: delegate values() to _sorted_records() (#19)

Eliminate code duplication by having TableMixin.values() call
_sorted_records() instead of reimplementing the same list
comprehension logic.

Author: tbhb

src/jsonlt/_mixin.py

@@ -200,8 +200,7 @@ def values(self) -> "list[JSONObject]":
             A list of all records, sorted by key.
         """
         self._prepare_read()
-        state = self._get_state()
-        return [state[k] for k in self._sorted_keys()]
+        return self._sorted_records()
 
     def items(self) -> "list[tuple[Key, JSONObject]]":
         """Get all key-value pairs in key order.