LinkedHashMap: Fix head being null when initializing from map (#2334)

* LinkedHashMap: Fix head being null when initializing from map

lib/std/collections/linked_hashmap.c3

@@ -533,14 +533,9 @@ fn void LinkedHashMap.transfer(&map, LinkedEntry*[] new_table) @private
 fn void LinkedHashMap.put_all_for_create(&map, LinkedHashMap* other_map) @private
 {
 	if (!other_map.count) return;
-	foreach (LinkedEntry *e : other_map.table)
-	{
-		while (e)
-		{
-			map.put_for_create(e.key, e.value);
-			e = e.next;
-		}
-	}
+	other_map.@each(; Key key, Value value) {
+		map.set(key, value);
+	};
 }
 
 fn void LinkedHashMap.put_for_create(&map, Key key, Value value) @private

test/unit/stdlib/collections/linked_map.c3

@@ -136,6 +136,7 @@ fn void linked_map_copy()
 		assert(key == expected_order[index]);
 		index++;
 	};
+	assert(index == 3); // check if @each worked
 }
 
 fn void linked_map_iterators()