fix margin on attached segments with headers (#10235)

Fixes: https://github.com/go-gitea/gitea/issues/10210

Co-authored-by: techknowlogick <matti@mdranta.net>

web_src/less/_base.less

@@ -1196,3 +1196,8 @@ i.icon.centerlock {
 .invisible {
     visibility: hidden;
 }
+
+/* https://github.com/go-gitea/gitea/issues/10210 */
+.ui.attached.segment + .ui.attached.header {
+    margin-top: 1rem;
+}