fix: format markdown in 1030 (#447)

Munmud · web-flow · commit d7d5f33379e6 · 2023-05-13T22:49:13.000+06:00
The code was broken [see the tutorial](https://lightoj.com/problem/discovering-gold)
diff --git a/1030/en.md b/1030/en.md
@@ -54,3 +54,4 @@ int main() {
         cs++;
     }
 }
+```
