Don't scroll to the top when navigating between posts in a thread

Fixes https://gitlab.com/soapbox-pub/soapbox/-/issues/1778

src/components/scroll-context.tsx

@@ -9,6 +9,12 @@ export const ScrollContext: React.FC<IScrollContext> = ({ children }) => {
   const location = useLocation<{ soapboxModalKey?: number } | undefined>();
 
   useEffect(() => {
+    // HACK: Don't scroll when navigating between posts.
+    // Surely there's a better way, so that components can negate the behavior from within instead of out here.
+    if (location.pathname.includes('/posts/')) {
+      return;
+    }
+
     if (!location.state?.soapboxModalKey) {
       window.scrollTo(0, 0);
     }