LazUtils: better fix for encoding of string returned by GetAppConfigFileUTF8
(Use WideString variant of GetSpecialDir which retruns UTF8: copy/paste error in r43495)


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@43611 4005530d-fff6-0310-9dd1-cebe43e6787f