Fix thread settings clippy failure

[etraut-openai]

Why

main picked up two small Rust build failures after nearby merges:

• Sync TUI thread settings through app server #23507 added a real handler for ServerNotification::ThreadSettingsUpdated, but the same variant was still listed in the ignored-notification match arm. Full Clippy runs treat the resulting unreachable-pattern warning as an error.
• feat: add turn_id and truncation_policy to extension tool calls #23666 added turn_id and truncation_policy to codex_tools::ToolCall, while the goal extension backend test fixtures from the goal-extension work still used the old shape. That left codex-goal-extension tests unable to compile once the branches met on main.

What changed

Removed the duplicate ThreadSettingsUpdated match pattern from tui/src/chatwidget/protocol.rs.

Updated the goal extension test tool_call helper to populate the new ToolCall fields, and reused that helper for the one direct literal that still had the old field list.

Verification

• just fix -p codex-tui
• cargo test -p codex-goal-extension