caddytls: Remove "IssuerRaw" field
caddytls: Remove "IssuerRaw" field

Has been deprecated and printing warnings for about 8 months now.
Replaced by "IssuersRaw" field in v2.3.0.

l3dlp/caddy,mholt/caddy,l3dlp/caddy,mholt/caddy,l3dlp/caddy