Fix status overflowing in report dialog (#12959)

Fixes #12942

app/javascript/styles/mastodon/components.scss

@@ -1086,6 +1086,7 @@
   .status-check-box__status {
     margin: 10px 0 10px 10px;
     flex: 1;
+    overflow: hidden;
 
     .media-gallery {
       max-width: 250px;