The cli command checks for missing blocks from 0

**Describe the bug**
The cli command `scrape_block_range` checks for missing blocks from block 0 even when a `start_block_number` is being provided.
 
**Expected behavior**
The command should check for missing blocks from the start_block_number and not block 0.

**Additional context**
First encountered at issue: https://github.com/analyseether/ether_sql/issues/60