[cleanup] cleanup scripts/solve_disambiguation.py
[cleanup] cleanup scripts/solve_disambiguation.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
- use "+" in concatenating string type specifiers in some cases

Change-Id: I66cfb8b4a06e33d0a79639eaaafa9d5520b8ae85

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