Redirect /users/:nickname.rss to /users/:nickname/feed.rss instead of .atom

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

test/pleroma/web/feed/user_controller_test.exs

@@ -282,6 +282,21 @@ defmodule Pleroma.Web.Feed.UserControllerTest do
                "#{Pleroma.Web.Endpoint.url()}/users/#{user.nickname}/feed.atom"
     end
 
+    test "redirects to rss feed when explicitly requested", %{conn: conn} do
+      note_activity = insert(:note_activity)
+      user = User.get_cached_by_ap_id(note_activity.data["actor"])
+
+      conn =
+        conn
+        |> put_req_header("accept", "application/xml")
+        |> get("/users/#{user.nickname}.rss")
+
+      assert conn.status == 302
+
+      assert redirected_to(conn) ==
+               "#{Pleroma.Web.Endpoint.url()}/users/#{user.nickname}/feed.rss"
+    end
+
     test "with non-html / non-json format, it returns error when user is not found", %{conn: conn} do
       response =
         conn