CORE: Fix Gulden.conf ini file "group" handling.
CORE: Fix Gulden.conf ini file "group" handling.

Properly allow for [mainnet] [regtest] [testnet] groups within the same config file.

nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official,nlgcoin/guldencoin-official