fix: L1 sync start height

[jfldde]

Description

• Prevent L1 syncer from re-processing last scanned block on startup

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.3%. Comparing base (ce550b9) to head (ceb04b6).

Additional details and impacted files

Files with missing lines	Coverage Δ
bin/citrea/src/main.rs	80.4% <ø> (ø)

... and 2 files with indirect coverage changes

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[jfldde]

/skip-changelog