Update payload ID for bench test

Was 0x7777 now 0x8888
Old number was invalid (odd).

Found in firmware from 0fc4cbc on.

main.c

@@ -173,7 +173,7 @@ int stopLogging(void)
  * Packet content description:
  *
  * 0x00 flags - correct
- * 0x7777 payload ID - correct
+ * 0x8888 payload ID - correct
  * 0x01 mode - correct
  * 0x0C events per cycle / base teeth = 12/0x0C for default, 36/0x24 for common
  * 0xFFFF cycles, max this out
@@ -189,7 +189,7 @@ int stopLogging(void)
 int setupBenchTest(uint8_t eventsPerCycle, uint16_t ticksPerEvent)
 {
         const int missingToothOffset = 16;
-	static uint8_t setupBenchTestPacket[] = { 0x00, 0x77, 0x77, 0x01, 0x0C, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+	static uint8_t setupBenchTestPacket[] = { 0x00, 0x88, 0x88, 0x01, 0x0C, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
         if (nMissingTeeth > 5 || nMissingTeeth < 0) {
                 nMissingTeeth = 1;
                 fprintf(stderr, "Using 1 missing tooth. \n");