Tweaks to clear_config calls in tests in order to prevent side effects on config during test suite execution.

test/web/admin_api/admin_api_controller_test.exs

@@ -1890,9 +1890,7 @@ defmodule Pleroma.Web.AdminAPI.AdminAPIControllerTest do
     end
 
     test "when configuration from database is off", %{conn: conn} do
-      initial = Pleroma.Config.get(:configurable_from_database)
       Pleroma.Config.put(:configurable_from_database, false)
-      on_exit(fn -> Pleroma.Config.put(:configurable_from_database, initial) end)
       conn = get(conn, "/api/pleroma/admin/config")
 
       assert json_response(conn, 400) ==