remove onScroll in Prevew.tsx

apps/app/src/components/PageEditor/Preview.tsx

@@ -36,11 +36,6 @@ const Preview = React.forwardRef((props: Props, ref: RefObject<HTMLDivElement>):
       className={`${moduleClass} ${fluidLayoutClass} ${pagePath === '/Sidebar' ? 'preview-sidebar' : ''}`}
       ref={ref}
       style={{ paddingBottom: pastEnd }}
-      onScroll={(event: SyntheticEvent<HTMLDivElement>) => {
-        if (props.onScroll != null) {
-          props.onScroll(event.currentTarget.scrollTop);
-        }
-      }}
     >
       { markdown != null && (
         <RevisionRenderer rendererOptions={rendererOptions} markdown={markdown}></RevisionRenderer>