Remove the custom resize handle from the notebook native query preview sidebar (again) (#44021)

frontend/src/metabase/query_builder/components/view/View/NotebookContainer/NotebookContainer.tsx

@@ -4,7 +4,6 @@ import type { ResizeCallbackData, ResizableBoxProps } from "react-resizable";
 import { ResizableBox } from "react-resizable";
 import { useWindowSize } from "react-use";
 
-import { darken } from "metabase/lib/colors";
 import { useSelector, useDispatch } from "metabase/lib/redux";
 import {
   setNotebookNativePreviewSidebarWidth,
@@ -81,14 +80,11 @@ export const NotebookContainer = ({
         top={0}
         bottom={0}
         m="auto 0"
-        h={rem(100)}
         w={rem(handleWidth)}
         left={left}
-        bg={darken("border", 0.03)}
         style={{
           zIndex: 5,
           cursor: "ew-resize",
-          borderRadius: rem(8),
         }}
       ></Box>
     );