Fix broken .comment > .content caused by #13457 (#13482)

Co-authored-by: Lauris BH <[email protected]>

Author: CirnoT

web_src/less/_repository.less

@@ -1000,7 +1000,9 @@
         .comment-container {
           border: 1px solid var(--color-secondary);
           border-radius: var(--border-radius);
+        }
 
+        .content {
           > .merge-section {
             background-color: var(--color-box-body);