Fixes newspapers being unreadable. (#92372)

## About The Pull Request

Apparently the scrollbar on newspapers got lost, meaning tabbing to a
page too large to render in the box would get you stuck until you resize
it so you can see everything that's off-screen. Yes, including the page
buttons.
This just adds `scrollable`, fixing that issue.
Adds `scrollable` to newspapers such that they're actually readable
again, instead of

I think it'd be better if the previous/next page buttons were always on
screen and the stories would have a scrollbar, but after a while of
trying to do that with no progress I'm just posting this fix that
returns it to the previous functional state first.

tgui/packages/tgui/interfaces/Newspaper.tsx

@@ -40,7 +40,7 @@ export const Newspaper = (props) => {
 
   return (
     <Window width={300} height={400}>
-      <Window.Content backgroundColor="#858387">
+      <Window.Content backgroundColor="#858387" scrollable>
         {current_page === channels.length + 1 ? (
           <NewspaperEnding />
         ) : current_page ? (