fix coinbase audit

backend/src/api/audit.ts

@@ -29,6 +29,7 @@ class Audit {
     let matchedWeight = 0;
     let projectedWeight = 0;
 
+    let countCb = 0;
     let spamWeight = 0;
     let blkWeight = 0;
 
@@ -82,12 +83,15 @@ class Audit {
     }
 
     for (const tx of transactions){
+      if (countCb !== 0){
         if(tx.spam !== undefined){
           if (tx.spam == true){
             spamWeight += tx.weight;
           }
         }
       }
+      countCb += 1;
+    }
 
     // we can expect an honest miner to include 'displaced' transactions in place of recent arrivals and censored txs
     // these displaced transactions should occupy the first N weight units of the next projected block