Fix small font size for diff comments

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

app/assets/stylesheets/pages/diff.scss

@@ -45,7 +45,7 @@
     overflow-y: hidden;
     background: #FFF;
     color: #333;
-    font-size: $code_font_size;
+
     .old {
       span.idiff {
         background-color: #f8cbcb;
@@ -82,7 +82,7 @@
       border: none;
       margin: 0px;
       padding: 0px;
-      td {
+      .line_holder td {
         line-height: $code_line_height;
         font-size: $code_font_size;
       }

app/assets/stylesheets/pages/notes.scss

@@ -132,8 +132,6 @@ ul.notes {
 }
 .diff-file .notes_holder {
-  font-size: 13px;
-  line-height: 18px;
   font-family: $regular_font;
   td {