So that the message displayed to the user when the URL Pre-Flight check
fails is:
> Snipe-IT thinks your URL is SCHEME://DOMAIN, but your real
URL is SCHEME://DOMAIN/setup
instead of:
> Snipe-IT thinks your URL is SCHEME://DOMAIN/setup, but your real
URL is SCHEME://DOMAIN/setup
Having a missing "/setup" in the expected URL might confuse the user
into thinking that it is an additional configuration problem they need
to fix.
With this change, the comparison between the expected and actual URL
will not contain any accidental difference anymore. Only those that the
user really needs to be aware of and fix in their setup.