Css class additions (#10532)

* Category Page / Tag Class Additions

These additions add:

-the name of the tag as a css class to discourse tags.
-'pinned' as a css class to pinned topics in the category view

app/assets/javascripts/discourse/app/components/latest-topic-list-item.js

@@ -9,7 +9,8 @@ export default Component.extend({
   classNameBindings: [
     ":latest-topic-list-item",
     "topic.archived",
-    "topic.visited"
+    "topic.visited",
+    "topic.pinned"
   ],
 
   showEntrance,

app/assets/javascripts/discourse/app/lib/render-tag.js

@@ -16,7 +16,7 @@ export function defaultRenderTag(tag, params) {
   params = params || {};
   const visibleName = escapeExpression(tag);
   tag = visibleName.toLowerCase();
-  const classes = ["discourse-tag"];
+  const classes = ["discourse-tag", tag];
   const tagName = params.tagName || "a";
   let path;
   if (tagName === "a" && !params.noHref) {