fix bug in string serializer

Author: t3ran13

Tools/ChainOperations/OperationSerializer.php

@@ -108,7 +108,7 @@ public static function serializeType($type, $value, $byteBuffer)
             //Writes a UTF8 encoded string prefixed 32bit base 128 variable-length integer.
             $strLength = strlen($value);
 
-            if ($strLength < 128) {
+            if ($strLength <= 128) {
                 $byteBuffer->writeInt8($strLength);
             } else {