start: fix result check when using multiple domains

[aleeraser]

When using multiple domains (e.g. as a comma-separated list), certbot will store the certificates in a folder named after the first domain.

Citing the docs:

All domains will be included as Subject Alternative Names on the certificate. The first domain will be used as the certificate name, unless otherwise specified or if you already have a certificate with the same name. In the case of a name conflict, a number like -0001 will be appended to the certificate name