Error on Android, rev3177

* ZeroNet version: 0.6.0(rev3177
* Operating system: Android 5.1
* Web browser: Chrome 62.0.3202.84 (32bit)
* Tor status: not available
* Opened port: yes
* Special configuration:

Describe the problem:
Internal error: TypeError. actionSiteSetLimit() takes exactly 3 arguments (2 given)
UiWebsocket.py line 81 > UiWebsocket.py line 256 > UiWebsocket.py line 333 > UiWebsocket.py line 260

#### Steps to reproduce:
This may be hard to reproduce, I've only seen it twice, usually when downloading a site.

#### Observed Results:
![screenshot_2017-12-23-23-24-31-64](https://user-images.githubusercontent.com/24760218/34320815-a019db70-e83c-11e7-99b3-456c3d2418a2.png
[debug-last.log](https://github.com/HelloZeroNet/ZeroNet/files/1584248/debug-last.log)
[debug.log](https://github.com/HelloZeroNet/ZeroNet/files/1584249/debug.log)

#### Expected Results:

Start by reviewing UiWebsocket.py at lines 81, 256, 260, and 333, then inspect debug-last.log and debug.log for the failing download context. Try reproducing the error while downloading a site and confirm the TypeError no longer occurs.

索引モデルが issue の本文から書いたものです。