[cleanup] use Bot's default run method
[cleanup] use Bot's default run method

- use SingleSiteBot instead of Bot class
- rename treat to treat_links
- rename run to treat; the loop over the generator is done by the Bot's
  run method.

Bug: T171713
Change-Id: I3145887c862657a46b4bc1f7bb0717c24dd52d88

PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core