Fix overflow of long profile fields in admin view (#17010)

app/javascript/styles/mastodon/admin.scss

@@ -831,6 +831,7 @@ a.name-tag,
     padding: 0 5px;
     margin-bottom: 10px;
     flex: 1 0 50%;
+    max-width: 100%;
   }
 
   .account__header__fields,