4699 update the onboarding app placeholder (#5616)

## Before

![image](https://github.com/twentyhq/twenty/assets/29927851/e9055c16-eed3-48f1-a4e2-df115a6c2247)

## After

![image](https://github.com/twentyhq/twenty/assets/29927851/254c7573-81c7-487e-b653-5b0ba311cf9e)

packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/NavigationDrawerSectionTitle.tsx

@@ -20,9 +20,9 @@ export const NavigationDrawerSectionTitle = ({
   label,
 }: NavigationDrawerSectionTitleProps) => {
   const loading = useIsPrefetchLoading();
-  return loading ? (
-    <NavigationDrawerSectionTitleSkeletonLoader />
-  ) : (
-    <StyledTitle>{label}</StyledTitle>
-  );
+
+  if (loading) {
+    return <NavigationDrawerSectionTitleSkeletonLoader />;
+  }
+  return <StyledTitle>{label}</StyledTitle>;
 };