Fix test warnings

test/pleroma/web/admin_api/controllers/config_controller_test.exs

@@ -1427,13 +1427,11 @@ test "custom instance thumbnail", %{conn: conn} do
         ]
       }
 
-      res =
       assert conn
              |> put_req_header("content-type", "application/json")
              |> post("/api/pleroma/admin/config", %{"configs" => [params]})
-               |> json_response_and_validate_schema(200)
-
-      assert res == %{
+             |> json_response_and_validate_schema(200) ==
+               %{
                  "configs" => [
                    %{
                      "db" => [":instance_thumbnail"],
@@ -1445,12 +1443,11 @@ test "custom instance thumbnail", %{conn: conn} do
                  "need_reboot" => false
                }
 
-      _res =
       assert conn
              |> get("/api/v1/instance")
              |> json_response_and_validate_schema(200)
-
-      assert res = %{"thumbnail" => "https://example.com/media/new_thumbnail.jpg"}
+             |> Map.take(["thumbnail"]) ==
+               %{"thumbnail" => "https://example.com/media/new_thumbnail.jpg"}
     end
 
     test "Concurrent Limiter", %{conn: conn} do