Add new timezones from tzdata to digital-clock applet timezone city table

Regenerate timezonesi18n_generated.h to fix a render issue where newly added timezones (e.g Europe/Kyiv added in tzdata 2022b) can be added to the digital clock widget, but won't display correctly:

This is because the city localization lookup fails when a timezone is missing from timezoneCityToL10nMap() in timezonesi18n_generated.h.

Also updates timezonesi18n_generate.rb to use native spelling of Ukrainian cities in timezone table generation script, to match spelling used in other parts of KDE, see: https://bugs.kde.org/show_bug.cgi?id=432503.