If mpd.conf files exists in the /conf directory, link to it instead of generating a new one from config.xml data.
If mpd.conf files exists in the /conf directory, link to it instead of
generating a new one from config.xml data.

This allows power users to tweak mpd conf to their delight, and gives
devs a way of testing out conf tweaks without needing to alter php code.

NewEraCracker/pfsense,brunostein/pfsense,brunostein/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,pfsense/pfsense,NewEraCracker/pfsense,NOYB/pfsense,jxmx/pfsense,pfsense/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,NOYB/pfsense,NewEraCracker/pfsense,pfsense/pfsense,ch1c4um/pfsense,dennypage/pfsense,ptorsten/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,NewEraCracker/pfsense,phil-davis/pfsense,dennypage/pfsense,ptorsten/pfsense,phil-davis/pfsense,ch1c4um/pfsense,pfsense/pfsense,jxmx/pfsense,dennypage/pfsense,dennypage/pfsense,NOYB/pfsense,ptorsten/pfsense,brunostein/pfsense,jxmx/pfsense