fix(benchmark): fix compression so it works even when not batching (#3029)

Signed-off-by: Robin Han <hanxvdovehx@gmail.com>

Author: superhx

tools/src/main/java/org/apache/kafka/tools/automq/PerfCommand.java

@@ -309,13 +309,10 @@ private List<byte[]> randomPayloads(int size, double randomRatio, int count) {
         int randomBytes = (int) (size * randomRatio);
         int staticBytes = size - randomBytes;
         byte[] staticPayload = new byte[staticBytes];
-        r.nextBytes(staticPayload);
-
         if (randomBytes == 0) {
             // all payloads are the same, no need to create multiple copies
             return List.of(staticPayload);
         }
-
         List<byte[]> payloads = new ArrayList<>(count);
         for (int i = 0; i < count; i++) {
             byte[] payload = new byte[size];