Fix media files DescCreated sorting param, add AscUpdated, DescUpdated.

Author: Konstantin Kolesnikov

api/media/assets.go

@@ -29,7 +29,9 @@ const (
 	AscName     Sort = "ASC_NAME"
 	DescName    Sort = "DESC_NAME"
 	AscCreated  Sort = "ASC_CREATED"
-	DescCreated Sort = "ASC_CREATED"
+	DescCreated Sort = "DESC_CREATED"
+	AscUpdated  Sort = "ASC_UPDATED"
+	DescUpdated Sort = "DESC_UPDATED"
 	AscHeight   Sort = "ASC_HEIGHT"
 	DescHeight  Sort = "DESC_HEIGHT"
 	AscWidth    Sort = "ASC_WIDTH"