fix comment about dust logic

src/core.h

@@ -192,10 +192,10 @@ public:
         // which has units satoshis-per-kilobyte.
         // If you'd pay more than 1/3 in fees
         // to spend something, then we consider it dust.
-        // A typical txout is 33 bytes big, and will
+        // A typical txout is 34 bytes big, and will
         // need a CTxIn of at least 148 bytes to spend,
         // so dust is a txout less than 54 uBTC
-        // (5430 satoshis) with default nMinRelayTxFee
+        // (5460 satoshis) with default nMinRelayTxFee
         return ((nValue*1000)/(3*((int)GetSerializeSize(SER_DISK,0)+148)) < nMinRelayTxFee);
     }