Get rid of unsafe variables.

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -212,14 +212,14 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
         |> Map.put("actor_id", ap_id)
         |> Map.put("whole_db", true)
 
-      if params["pinned"] == "true" do
-        # Since Pleroma has no "pinned" posts feature, we'll just set an empty list here
-        activities = []
-      else
-        activities =
+      activities =
+        if params["pinned"] == "true" do
+          # Since Pleroma has no "pinned" posts feature, we'll just set an empty list here
+          []
+        else
           ActivityPub.fetch_public_activities(params)
           |> Enum.reverse()
-      end
+        end
 
       conn
       |> add_link_headers(:user_statuses, activities, params["id"])