demux_playlist: unquote entries in pls playlists

I guess these parsers still have a way to go...

demux/demux_playlist.c

@@ -158,6 +158,9 @@ static int parse_pls(struct pl_parser *p)
         if (bstr_split_tok(line, "=", &key, &value) &&
             bstr_case_startswith(key, bstr0("File")))
         {
+            value = bstr_strip(value);
+            if (bstr_startswith0(value, "\"") && bstr_endswith0(value, "\""))
+                value = bstr_splice(value, 1, -1);
             pl_add(p, value);
         }
     }