'mc -a' shows ^@ for most box drawing elements. Some drawing elements
only show as ^ as the @ is overwritten by other characters.
Revert "(mc_skin_lines_parse_ini_file): do not overwrite mc_tty_frm array in case of slow and ugly terminal."
This reverts commit 6d639ce942db508e9cf20b6e4b446e46d6d05ce0.
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>