[Enhancement]: Save media folder / file names URL-decoded in the server.log

[stalchuk]

Preconditions:

1. Media folder / file names contain non-ANSI characters
2. Media folder was successfully scanned

Steps to reproduce:

1. Remove some file(s)
2. Re-scan [Look for new and changed media files]
3. Open 'server.log'

AR: Media folder / file names URL-encoded (e.g.: %2Fdata%2F%D0%BC%D0%BE%D1%8F+%D0%BC%D1%83%D0%B7%D1%8B%D0%BA%D0%B0%2F%D0%BFec%D0%BD%D1%8F.flac) ER: Media folder / file names URL-decoded (e.g.: /data/моя музыка/пecня.flac)

ENV: Logitech Media Server Version: 7.7.6 - 1521467459 @ Thu Mar 29 16:57:02 CEST 2018 Operating system: Linux - EN - utf8 Platform Architecture: armv5tejl Perl Version: 5.26.1 - arm-linux Database Version: DBD::SQLite 1.64 (sqlite 3.29.0)