fix(identity-wallet): address code review feedback for Phase 1
- Remove unused `getRelayUrl` import from +page.svelte line 20. The function
is not called in the onMount logic; RelayConfigScreen handles relay URL
checking internally.
- Condense legacy user fallback comment block from 10 lines to 3 lines.
The comment was verbose and described a no-op — RelayConfigScreen already
handles the saved relay URL internally, so no additional onMount logic is
needed.