remove previous "allow user routes" functionality

lib/pleroma/web/plugs/mapped_signature_to_identity_plug.ex

@@ -67,7 +67,8 @@ def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
         Logger.debug("Failed to map identity from signature (lookup failure)")
         Logger.debug("key_id=#{inspect(key_id_from_conn(conn))}")
 
-        only_permit_user_routes(conn)
+	conn
+	|> assign(:valid_signature, false)
 
       _ ->
         Logger.debug("Failed to map identity from signature (no payload actor mismatch)")
@@ -81,16 +82,6 @@ def call(%{assigns: %{valid_signature: true}} = conn, _opts) do
   # no signature at all
   def call(conn, _opts), do: conn
 
-  defp only_permit_user_routes(%{path_info: ["users", _]} = conn) do
-    conn
-    |> assign(:limited_ap, true)
-  end
-
-  defp only_permit_user_routes(conn) do
-    conn
-    |> assign(:valid_signature, false)
-  end
-
   defp key_id_from_conn(conn) do
     case HTTPSignatures.signature_for_conn(conn) do
       %{"keyId" => key_id} when is_binary(key_id) ->