ci: reformat two files ruff 0.15.14 would rewrite

`pre-commit run --all-files` fails on `dev` at the `ruff-format` hook, so every
open pull request is red on a check that has nothing to do with its own diff.
Both files arrived with 72da7ee (pr-436) formatted by an earlier ruff.

Purely cosmetic, and exactly what `ruff format` produces:

- `sqlite_handler.py` — a generator expression and an f-string concatenation
  that both now fit inside the line limit unsplit.
- `test_companion_import_repeater_contacts.py` — the blank line ruff requires
  after a module docstring.

tests/test_companion_import_repeater_contacts.py

@@ -18,6 +18,7 @@ than 1 even on an unfiltered import.
 
 Both derived the mapping independently; they now share one table.
 """
+
 import os
 import shutil
 import sqlite3