取消逻辑删除的默认值

Author: zoooooway

mapper/src/main/java/io/mybatis/mapper/logical/LogicalColumn.java

@@ -17,5 +17,5 @@
   /**
    * 表示逻辑删除的值，比如null、0
    */
-  String delete() default "null";
+  String delete();
 }