Fix crash caused filter tombstone-ing an item

lib/frenzy/update_feeds.ex

@@ -1,6 +1,6 @@
 defmodule Frenzy.UpdateFeeds do
   use GenServer
-  alias Frenzy.{Repo, Feed, Item, FilterEngine}
+  alias Frenzy.{Repo, Feed, Item}
   import Ecto.Query
   require Logger
 
@@ -70,10 +70,10 @@ defmodule Frenzy.UpdateFeeds do
          status_code: 200,
          body: body,
          headers: headers
-       }} = response ->
+       }} ->
         {_, content_type} =
           headers
-          |> Enum.find(fn {k, v} -> k == "Content-Type" end)
+          |> Enum.find(fn {k, _v} -> k == "Content-Type" end)
 
         content_type =
           content_type
@@ -183,7 +183,7 @@ defmodule Frenzy.UpdateFeeds do
       :tombstone ->
         changeset =
           Ecto.build_assoc(feed, :items, %{
-            guid: entry.id,
+            guid: item_params.guid,
             tombstone: true
           })