posts: fix favorite icon.

Fix the favorite button using the outlined heart icon instead of the
solid heart icon.

app/components/post_preview_component.rb

@@ -4,7 +4,7 @@ class PostPreviewComponent < ApplicationComponent
   with_collection_parameter :post
 
   attr_reader :post, :tags, :show_deleted, :show_cropped, :link_target, :pool, :pool_id, :favgroup_id, :similarity, :recommended, :compact, :size, :current_user, :options
-  delegate :external_link_to, :time_ago_in_words_tagged, :favorite_icon, to: :helpers
+  delegate :external_link_to, :time_ago_in_words_tagged, :empty_heart_icon, to: :helpers
 
   def initialize(post:, tags: "", show_deleted: false, show_cropped: true, link_target: post, pool: nil, pool_id: nil, favgroup_id: nil, similarity: nil, recommended: nil, compact: nil, size: nil, current_user: CurrentUser.user, **options)
     @post = post

app/components/post_preview_component/post_preview_component.html.erb

@@ -38,7 +38,7 @@
       <%= link_to recommended_posts_path(search: { post_id: post.id }), class: "more-recommended-posts", "data-post-id": post.id do %>
         <%= post.fav_count %>
 
-        <%= favorite_icon(class: "fa-xs") %>
+        <%= empty_heart_icon(class: "fa-xs") %>
 
         <br>more »
       <% end %>