RandomAccessFileAppender does not write header to file

## Description

RandomAccessFileAppender does not write the header configured in the layout to the output file.

## Configuration

**Version:** 2.22.0

**Operating system:** Windows 10

**JDK:** Temurin 11.0.16.1

## Reproduction

Using the following log4j2.xml:
```

%d{DEFAULT} [%-5p] %c{1} - %m%n

*** HEADER ***${sys:line.separator}

```

Combined with a simple program that just logs something, ie:
```
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class Test {
private static final Logger LOG = LogManager.getLogger();

public static void main(String[] args) {
LOG.info("Test");
}
}
```

This creates two files. The file.log is as expected:
```
*** HEADER ***
2023-11-30 16:54:04,898 [INFO ] Test - Test
```

But randomaccessfile.log does not contain the header line:
```
2023-11-30 16:54:04,898 [INFO ] Test - Test
```