[cleanup] cleanup scripts/states_redirect.py
[cleanup] cleanup scripts/states_redirect.py

- use single quotes for string literals and double quotes with
  strings that consist of single quotes within them
- use str.format(...) instead of modulo for type specifiers in
  strings
- remove preleading "u" from strings

Change-Id: If045d835f9f750706b85582294d2842a27ac700d

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