Fix password reset for non-test env

Fixes `Plug.Conn.NotSentError` that causes a 5xx error in response
instead of 404 and 400.

Fixes pattern matching error caused by different response format
in test and non-test env: `Pleroma.Emails.Mailer.deliver_async` returns
:ok when PleromaJobQueue is enabled and `{:ok, _}` when it's disabled.
In tests, it's disabled.

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -1826,10 +1826,10 @@ defmodule Pleroma.Web.MastodonAPI.MastodonAPIController do
       |> json("")
     else
       {:error, "unknown user"} ->
-        put_status(conn, :not_found)
+        send_resp(conn, :not_found, "")
 
       {:error, _} ->
-        put_status(conn, :bad_request)
+        send_resp(conn, :bad_request, "")
     end
   end