Don't log in deactivated users.

lib/pleroma/plugs/oauth_plug.ex

@@ -16,7 +16,8 @@ defmodule Pleroma.Plugs.OAuthPlug do
             end
     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) do
+         %User{} = user <- Repo.get(User, user_id),
+         false <- !!user.info["deactivated"] do
       conn
       |> assign(:user, user)
     else