Fix crash-causing bugs from automated PEP8 pass and broken imports

[pQu4k3r]

The "Apply auto PEP8 aggressive fixes" commit split several f-strings
across multiple lines with a literal newline inside the {} expression.
That's a hard SyntaxError on any Python before 3.12 (Enigma2 boxes run
3.8/3.9), so analisi_screen.py, archivio_screen.py,
superenalotto_screen.py and dieci_lotto_screen.py failed to import at
all, breaking the whole plugin. Collapsed them back to single-line
f-strings.

main_screen.py imported a function name (aggiorna_archivio) that was
never called, while the names actually called in ok_pressed
(update_archive, download_and_convert_se) were never imported at all -
pressing "Update Lotto Archive" or "Update Superenalotto" raised
NameError. Fixed the imports to match what's actually used.

Also cleaned up dead/broken code found during the audit:

• Removed translate_utils.py, an unused leftover from an unrelated
  "Foreca One Weather" plugin that imported a SYSTEM_DIR constant
  never defined in this plugin (would ImportError if ever used).
• Removed unused json imports in core/update.py and
  core/update_superenalotto.py.
• Removed a dead get_archive() call in get_dieci_lotto().
• generate_fake_se_archive() now persists its generated archive via
  save_superenalotto_archive(), matching generate_fake_archive()'s
  behavior instead of regenerating random fake data on every call.