[bugfix] Fix TestCategoryObject test methods
[bugfix] Fix TestCategoryObject test methods

Category of "en:Wikipedia:Terms of use" has been changed.
Use another page instead to solve the test.

Bug: T235320
Change-Id: Iec7a1fd9900447ca507c4fcf4d8482afc9d736bc

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