Internal error: TypeError: actionBigfileUploadInit() takes 4 positional arguments but 5 were given UiWebsocket.py line 79 > UiWebsocket.py line 232 > MergerSite/MergerSitePlugin.py line 177 > MergerSite/MergerSitePlugin.py line 147

### Step 1: Please describe your environment

* ZeroNet version: 0.7.1
* Operating system: Win10
* Web browser: Chrome
* Tor status: not available/always/disabled
* Opened port: yes/no no
* Special configuration: no

### Step 2: Describe the problem:
Can't download all files as an archive anymore
#### Steps to reproduce:

1. Seed a file
2. then select "Download all files of this post as an archive" and get the error

#### Observed Results:

* What happened? This could be a screenshot, a description, log output (you can send log/debug.log file to hello@zeronet.io if necessary), etc.

#### Expected Results:

* What did you expect to happen?
That I can download the files

まず UiWebsocket.py の 79 行目と 232 行目にある traceback から始め、次に MergerSite/MergerSitePlugin.py の 147 行目と 177 行目、および actionBigfileUploadInit の呼び出しを調べます。ファイルを seed した後にアーカイブのダウンロードを再現し、“Download all files of this post as an archive” を選択しても TypeError なしで完了することを確認します。

索引モデルが issue の本文から書いたものです。