[build] Fixed tests.

- Negative yoffsets work only when moving before a field that is not the top field. Using 0 yoffset works both for moving before top fields and also before lower ones.
- xoffset seems to work fine with a value of 0, so I also removed the comment saying it doesn't.

xwiki-platform-core/xwiki-platform-appwithinminutes/xwiki-platform-appwithinminutes-test-pageobjects/src/main/java/org/xwiki/appwithinminutes/test/po/ApplicationClassEditPage.java

@@ -172,8 +172,7 @@ public Boolean apply(WebDriver driver)
      */
     public void moveFieldBefore(String fieldToMove, String beforeField)
     {
-        // Drag the field slightly before the target field (vertically). For some reason it doesn't work if we use x=0.
-        new ClassFieldEditPane(fieldToMove).dragTo(fieldsCanvas.findElement(By.id("field-" + beforeField)), 1, -30);
+        new ClassFieldEditPane(fieldToMove).dragTo(fieldsCanvas.findElement(By.id("field-" + beforeField)), 0, 0);
     }
 
     /**