Fix notification hub delete button being unclickable

Summary:
Per https://fb.workplace.com/groups/flippersupport/permalink/1808696106209891/, the delete button was clickable.

This was because the Ant dialog "X" was overlaying it. {F1474398631}
 Did the lazy fix and added some additional padding.
 {F1474398694}

Reviewed By: LukeDefeo

Differential Revision: D55467981

fbshipit-source-id: 74f3e37fdccd077766aaa3a3dd88c400a8bc324c

desktop/flipper-ui/src/sandy-chrome/notification/Notification.tsx

@@ -296,7 +296,11 @@ export function Notification() {
   return (
     <LeftSidebar>
       <Layout.Top>
-        <Layout.Container gap="tiny" padv="tiny" borderBottom>
+        <Layout.Container
+          gap="tiny"
+          padv="tiny"
+          borderBottom
+          style={{paddingRight: 24}}>
           <SidebarTitle actions={actions}>notifications</SidebarTitle>
           <Layout.Container padh="medium" padv="small">
             <Input