chore: delete duplicate test case

delete MetaObjectTest#shouldSetAndGetSelfListItem, it's repetitive.

close #2123

Author: juzi214032

src/test/java/org/apache/ibatis/reflection/MetaObjectTest.java

@@ -104,14 +104,6 @@ void shouldGetAndSetListItem() {
     assertEquals("foo", meta.getValue("richList[0]"));
   }
 
-  @Test
-  void shouldSetAndGetSelfListItem() {
-    RichType rich = new RichType();
-    MetaObject meta = SystemMetaObject.forObject(rich);
-    meta.setValue("richList[0]", "foo");
-    assertEquals("foo", meta.getValue("richList[0]"));
-  }
-
   @Test
   void shouldGetAndSetNestedListItem() {
     RichType rich = new RichType();