Fix subtle select_to_dictionary bug

src/lib/Enumerable.vala

@@ -541,7 +541,7 @@ namespace Invercargill {
         }
 
         public virtual Dictionary<TKey, TValue> select_to_dictionary<TKey, TValue>(TransformDelegate<T, TKey> key_selecter, TransformDelegate<T, TValue> value_selecter, HashDelegate<TKey>? key_hash_func = null, EqualityDelegate<TKey>? key_equal_func = null) {
-            var dict = new Dictionary<TKey, T>(key_hash_func, key_equal_func);       
+            var dict = new Dictionary<TKey, TValue>(key_hash_func, key_equal_func);       
             iterate(i => dict.add(key_selecter(i), value_selecter(i)));
             return dict;
         }