Add user muted status info to MastodonAPI.

lib/pleroma/user.ex

@@ -960,6 +960,7 @@ defmodule Pleroma.User do
     update_and_set_cache(cng)
   end
 
+  def mutes?(nil, _), do: false
   def mutes?(user, %{ap_id: ap_id}), do: Enum.member?(user.info.mutes, ap_id)
 
   def blocks?(user, %{ap_id: ap_id}) do

lib/pleroma/web/mastodon_api/views/status_view.ex

@@ -168,7 +168,7 @@ defmodule Pleroma.Web.MastodonAPI.StatusView do
       reblogged: present?(repeated),
       favourited: present?(favorited),
       bookmarked: present?(bookmarked),
-      muted: CommonAPI.thread_muted?(user, activity),
+      muted: CommonAPI.thread_muted?(user, activity) || User.mutes?(opts[:for], user),
       pinned: pinned?(activity, user),
       sensitive: sensitive,
       spoiler_text: object["summary"] || "",