XWIKI-21093: Undo / Redo doesn't work anymore

* Fix CI breaking due to afterEach method not being executed on last test of a scenario
* Fix comment

xwiki-platform-core/xwiki-platform-ckeditor/xwiki-platform-ckeditor-test/xwiki-platform-ckeditor-test-docker/src/test/it/org/xwiki/ckeditor/test/ui/UndoRedoIT.java

@@ -51,24 +51,21 @@ void beforeEach(TestUtils setup, TestReference testReference)
         edit(setup, testReference);
     }
 
-    @AfterEach
-    void afterEach(TestUtils setup, TestReference testReference)
-    {
-        maybeLeaveEditMode(setup, testReference);
-    }
-
     @Test
     @Order(1)
-    void undoRedoWithPlaceholder() throws Exception
+    void undoRedoWithPlaceholder(TestUtils setup, TestReference testReference) throws Exception
     {
         textArea.sendKeys("one", Keys.ENTER, "two", Keys.ENTER, "three", Keys.ENTER);
 
         // Undo 4 steps.
         textArea.sendKeys(Keys.chord(Keys.CONTROL, "zzzz"));
 
-        // Redo 2 steps
+        // Redo 2 steps.
         textArea.sendKeys(Keys.chord(Keys.CONTROL, Keys.SHIFT, "zz"));
 
         assertSourceEquals("one\n\ntwo\n\n ");
+        
+        // Clean up for following tests.
+        maybeLeaveEditMode(setup, testReference);
     }
 }