Update box brush duplication test to expect same center

tests/e2e/box-brush-authoring.e2e.ts

@@ -153,11 +153,7 @@ test("shift+d duplicates the current selection and does not trigger while typing
 
   const sourceCenter = beforeDuplicateSnapshot.document.brushes[sourceBrushId as string].center;
   const duplicatedCenter = afterDuplicateSnapshot.document.brushes[duplicatedBrushId as string].center;
-  expect(duplicatedCenter).toEqual({
-    x: sourceCenter.x + 1,
-    y: sourceCenter.y,
-    z: sourceCenter.z + 1
-  });
+  expect(duplicatedCenter).toEqual(sourceCenter);
 
   await page.getByTestId("selected-brush-name").click();
   await page.keyboard.press("Shift+D");