Incorrect katakana in Nihongo channel folder names

[rusq]

Describe the bug
Slack export for JPN contains channel folder names in hankaku, while it should be zenkaku as per this article.

The channel names for attachments, however, are in zenkaku.

This issue was initially mentioned in this discussion post

When the channel name contains Japanese full-width katakana characters, the directory name to save the slack message data (eg. 2022-10-10.json) will be half-width katakana with using slackdump. Attachments are saved in correct full-width katakana directories.

[rusq]

Sample name:

adapt_w_3dビューア

Issue confirmed:

[7:25:38] 1:wp/_github/slackdump (i144-zen-han)> go run ./cmd/slackdump -export i144.zip -download https://ora600.slack.com/archives/C045TUGSSTW
Slackdump dev Copyright (c) 2018-2077 rusq (build: placeho)

2022/10/09 19:25:43 > checking user cache...
2022/10/09 19:25:43   cache expired: it will be recreated.
2022/10/09 19:25:43 Export:  staring export to: <zip archive: i144.zip>
2022/10/09 19:25:44 messages request #    1, fetched:    4 (threads: 0, files: 1), total:        4 (speed:  13.04/sec, avg:  13.04/sec)
2022/10/09 19:25:44 messages fetch complete, total: 4
2022/10/09 19:25:45 file "F045TUJ5V0C-13_Final_Sin.jpeg" saved to adapt_w_3dビューア/attachments: 361840 bytes written
2022/10/09 19:25:45 completed, time taken: 2.036762078s
[7:25:45] 0:wp/_github/slackdump (i144-zen-han)> 7z l i144.zip 

7-Zip [64] 17.04 : Copyright (c) 1999-2021 Igor Pavlov : 2017-08-28
p7zip Version 17.04 (locale=utf8,Utf16=on,HugeFiles=on,64 bits,16 CPUs x64)

Scanning the drive for archives:
1 file, 358794 bytes (351 KiB)

Listing archive: i144.zip

--
Path = i144.zip
Type = zip
Physical Size = 358794

   Date      Time    Attr         Size   Compressed  Name
------------------- ----- ------------ ------------  ------------------------
2022-10-09 19:25:44 .....         6532         1289  adapt_w_3dﾋﾞｭｰｱ/2022-10-09.json
2022-10-09 19:25:44 .....          862          380  channels.json
2022-10-09 19:25:44 .....        15001         1755  users.json
2022-10-09 19:25:45 .....       361840       354652  adapt_w_3dビューア/attachments/F045TUJ5V0C-13_Final_Sin.jpeg
------------------- ----- ------------ ------------  ------------------------
2022-10-09 19:25:45             384235       358076  4 files

[rusq]

Fixed in #151

[rusq]

Released in https://github.com/rusq/slackdump/releases/tag/v2.2.1