fix(aggregation-mode): send sp1 proofs to the aggregation batcher (#2196)

Author: maximopalopoli

Makefile

@@ -336,7 +336,7 @@ agg_mode_batcher_send_sp1_proof:
 		-F "nonce=$${NONCE}" \
 		-F "proof=@scripts/test_files/sp1/sp1_fibonacci_5_0_0.proof" \
 		-F "program_vk=@scripts/test_files/sp1/sp1_fibonacci_5_0_0_vk.bin" \
-		-F "signature_hex=0x0" \
+		-F "_signature_hex=0x0" \
 		http://127.0.0.1:8089/proof/sp1
 
 __AGGREGATOR__: ## ____