fix(studio): bottom padding projects list (#47959)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

We had a rouge `pb-0` on the projects list eliminating the bottom
padding when the list/scroll is long enough.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Style**
* Improved spacing beneath the Projects page content for a more balanced
layout.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/studio/pages/org/[slug]/index.tsx

@@ -24,7 +24,7 @@ const ProjectsPage: NextPageWithLayout = () => {
 
   return (
     <ScaffoldContainer className="grow flex">
-      <ScaffoldSection isFullWidth className="pb-0">
+      <ScaffoldSection isFullWidth className="pb-12">
         {disableAccessMfa ? (
           <Admonition
             type="note"