fix page-comments styles

lib/views/crowi-plus/widget/comments.html

@@ -1,6 +1,6 @@
 <div class="page-comments-row row">
 
-  <div class="page-comments col-md-12">
+  <div class="page-comments col-md-7">
 
     <h4><i class="fa fa-comments"></i> Comments</h4>
 

resource/css/_comment_crowi-plus.scss

@@ -1,11 +1,11 @@
 .crowi-plus.main-container  {
 
   .page-comments-row {
+    border-top: 3px solid #f0f0f0;
     margin: 30px 16px;
   }
 
   .page-comments {
-    border-top: 3px solid #f0f0f0;
   }
 
   .page-comment {