fix: set first block at the beginning of batch execution

[joshieDo]

save_receipts requires the first_block to be set, otherwise it won't ever prune the receipts from the first block

reth/crates/revm/src/batch.rs

Lines 117 to 121 in 89c0c0f

	/// Save receipts to the executor.
	pub fn save_receipts(&mut self, receipts: Vec<Receipt>) -> Result<(), BlockExecutionError> {
	let mut receipts = receipts.into_iter().map(Some).collect();
	// Prune receipts if necessary.
	self.prune_receipts(&mut receipts).map_err(InternalBlockExecutionError::from)?;

reth/crates/revm/src/batch.rs

Lines 128 to 134 in 89c0c0f

	fn prune_receipts(
	&mut self,
	receipts: &mut Vec<Option<Receipt>>,
	) -> Result<(), PruneSegmentError> {
	let (Some(first_block), Some(tip)) = (self.first_block, self.tip) else { return Ok(()) };
	let block_number = first_block + self.receipts.len() as u64;