make streamer tests somewhat less flimsy

test/pleroma/web/mastodon_api/views/account_view_test.exs

@@ -119,7 +119,7 @@ test "Represent a user account" do
       ]
     end
 
-    test "is parsed when :instance_favicons is enabled", %{user: user, instance: instance} do
+    test "is parsed when :instance_favicons is enabled", %{user: user} do
       clear_config([:instances_favicons, :enabled], true)
 
       assert %{

test/pleroma/web/streamer_test.exs

@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.StreamerTest do
-  use Pleroma.DataCase
+  use Pleroma.DataCase, async: false
 
   import Pleroma.Factory