test: update footer snapshots to always show account name

Snapshots now reflect the new behaviour where the account indicator
is always visible (including "default"), matching the footer.rs change.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/snapshots/footer__footer_open_chat.snap

@@ -1,5 +1,6 @@
 ---
 source: tests/footer.rs
+assertion_line: 39
 expression: output
 ---
- Инициализация TDLib...
+ [default] Инициализация TDLib...