[cleanup] cleanup scripts/touch.py
[cleanup] cleanup scripts/touch.py

- removing preleading "u" from strings
- use of str.format(...) instead of modulo in changed lines
- use of single quotes for string literals

Change-Id: I95af5bbfab7d761d6d1f514575ea1bea4ae7c722

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