`routes_pathname_prefix` not respected for route authorization

[jannschu]

Hi!

The routes_pathname_prefix is not respected in the following which breaks public routes and callbacks if a prefix is used:

dash-auth/dash_auth/auth.py

Line 57 in 18f66d3

if request.path == "/_dash-update-component":

edit: Maybe this could be an alternative?

if request.url_rule and app.server.view_functions.get(request.url_rule.endpoint) == app.dispatch:

[olivier-lacroix]

Cc @RenaudLN