oauth plug: fix deactivated check

lib/pleroma/plugs/oauth_plug.ex

@@ -20,7 +20,7 @@ def call(conn, _) do
     with token when not is_nil(token) <- token,
          %Token{user_id: user_id} <- Repo.get_by(Token, token: token),
          %User{} = user <- Repo.get(User, user_id),
-         false <- !!user.info["deactivated"] do
+         false <- !!user.info.deactivated do
       conn
       |> assign(:user, user)
     else