Unify comment icon on legislation summaries

This was the only place in the application where the comments icon was
included without the span with the class "icon-comments".

We unified with the rest of the application and removed the
"comments-count" class which is no longer needed.

app/assets/stylesheets/layout.scss

@@ -2047,9 +2047,11 @@ table {
   width: 100%;
 }
 
+.annotation-summary,
 .budget-investment-info,
 .debate-info,
 .debate-meta,
+.debate-summary,
 .investment-project-info,
 .legislation-comments,
 .proposal-info,

app/assets/stylesheets/legislation_process.scss

@@ -966,10 +966,6 @@
     }
   }
 
-  .comments-count {
-    @include has-fa-icon(comments, regular);
-  }
-
   .question-title:not(:only-child) {
     margin-bottom: $line-height / 2;
   }