PLT-5792 Fixed all ephemeral posts using system message icons (#5709)

webapp/components/post_view/components/post.jsx

@@ -204,9 +204,7 @@ export default class Post extends React.Component {
                     src={PostUtils.getProfilePicSrcForPost(post, timestamp)}
                 />
             );
-        }
-
-        if (PostUtils.isSystemMessage(post)) {
+        } else if (PostUtils.isSystemMessage(post)) {
             profilePic = (
                 <span
                     className='icon'