chore: fix log (#4634)

Description
---
Fix the log `Block contains kernel excess`
This validator is used by the mempool for transactions and by the base_nodes for blocks

base_layer/core/src/validation/transaction_validators.rs

@@ -163,8 +163,9 @@ impl<B: BlockchainBackend> TxConsensusValidator<B> {
         for kernel in tx.body.kernels() {
             if let Some((db_kernel, header_hash)) = self.db.fetch_kernel_by_excess_sig(kernel.excess_sig.to_owned())? {
                 let msg = format!(
-                    "Block contains kernel excess: {} which matches already existing excess signature in chain \
-                     database block hash: {}. Existing kernel excess: {}, excess sig nonce: {}, excess signature: {}",
+                    "Aggregate body contains kernel excess: {} which matches already existing excess signature in \
+                     chain database block hash: {}. Existing kernel excess: {}, excess sig nonce: {}, excess \
+                     signature: {}",
                     kernel.excess.to_hex(),
                     header_hash.to_hex(),
                     db_kernel.excess.to_hex(),