This reverts commit 5b78935 which added:
- Sync type parameter (qsl_delta, qsl_full, qso_delta, qso_full)
- getLastLoTWQSODate() function
- Sync type dropdown on QSO page
- Job queue handling of sync types
Reason: LoTW doesn't provide DXCC entity data for unconfirmed QSOs,
which causes award calculation issues. Going back to QSL-only sync.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>