Increase detail-page-header padding to match height with nav-link

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/detail_page.scss

 .detail-page-header {
-  padding: 7px 0;
+  padding: 11px 0;
   border-bottom: 1px solid $border-color;
   color: #5c5d5e;
   font-size: 16px;