Update sample conf regarding debuglevel subsystems.
Update sample conf regarding debuglevel subsystems.

The debuglevel parameter has accepted subsystems in additional to an
overall level for quite some time, but the sample config file was not
updated to reflect that.

This commit updates the sample config file accordingly.

Roasbeef/btcd,soapboxsys/ombfullnode,soapboxsys/ombfullnode,BitGo/prova,jrick/dcrd,Dirbaio/btcd,Stash-Crypto/btcd,aakselrod/btcd,glv2/ppcd,qchain/btcd,jcmincke/dcrd,DanielKrawisz/btcd,pkothbauer/btcd,cqswxj2013/btcd,jrick/btcd,ppcsuite/ppcd-old,dajohi/btcd,dajohi/btcd,cjepson/btcd,FactomProject/btcd,ltcsuite/ltcd,dan-da/btcd,1d4Nf6/btcd,dan-da/btcd,tb00/btcd,btcsuite/btcd,mathiasrw/btcd,Cleawing/btcd,btcsuite/btcd,CryptocurrencyCabal/htcd,DanielKrawisz/btcd,jongillham/btcd,btcsuitereleases/btcd,decred/dcrd,hectorj/btcd,hectorj/btcd,runeaune/btcd,pkothbauer/btcd,danoctavian/btcd,Stash-Crypto/btcd,davecgh/btcd,cqswxj2013/btcd,sysbot/btcd,qchain/btcd,ltcsuite/ltcd,stevenroose/btcd,Cleawing/btcd,jimmysong/btcd,ppcsuite/ppcd,adiabat/btcd,davecgh/btcd,Roasbeef/btcd,jongillham/btcd,ppcsuite/ppcd,toddfries/btcd,glv2/ppcd,jcmincke/dcrd,cjepson/btcd,btcsuitereleases/btcd,ppcsuite/ppcd-old,aakselrod/btcd,1d4Nf6/btcd,jrick/btcd,jrick/dcrd,Evil-Coin/Evil,FactomProject/btcd,Evil-Coin/Evil,sysbot/btcd,CryptocurrencyCabal/htcd,tb00/btcd,jimmysong/btcd,mathiasrw/btcd,adiabat/btcd,dajohi/btcd,Dirbaio/btcd,Dirbaio/btcd,wallclockbuilder/btcd,jcmincke/dcrd,danoctavian/btcd,jrick/btcd,BitGo/prova,wallclockbuilder/btcd,stevenroose/btcd,decred/dcrd,toddfries/btcd,runeaune/btcd