chore: keep the handler error instead of trying to hijack it as it breaks the user experience.

[jcchavezs]

Currently when a later in the chain middleware returned an error with a certain status code, we attempted to wrap that error with an own error which lead to misleading behaviours

Closes https://github.com/corazawaf/coraza-caddy/issues/83.

Ping @rasschaert

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[jptosso]

It is working: https://tosso.io/experiment/basicauth username: foouser, password: foopassword

My settings:

    handle /experiment/basicauth {
        basicauth * {
            # not the actual credentials, just an example for github
            foouser $2a$14$EUkRdDpsoURnFJtZz3KhLuIIAirpmYdMYyetZI0uDR08ok3ZWp3I.
        }
        respond "It worked :)"
    }