Add WiFi log clean up to system cleaner

[Nitrovenom]

Name:"WiFi Logs", directory: /data/vendor/wlan_logs

This folder doesn't exist in all devices.

[d4rken]

Please provide more details, paths, sample files, possibly a file dump:
https://github.com/d4rken/sdmaid-public/wiki/Explorer#save-directory-structure

Device/ROM, your current SD Maid version...