Can't reuse ffmpeg

**Describe the bug**
GIVEN I load ffmpeg
AND I run any command
AND I run another command
THEN an error is thrown

```
[info] run ffmpeg command: -L
Uncaught (in promise)
{
"name": "ExitStatus",
"message": "Program terminated with exit(0)",
"status": 0
}
```

**To Reproduce**

```
const fs = require('fs');
const { createFFmpeg, fetchFile } = require('@ffmpeg/ffmpeg');

const ffmpeg = createFFmpeg({ log: true });

(async () => {
await ffmpeg.load();
await ffmpeg.run('-L');
await ffmpeg.run('-L');
})();
```

**Expected behavior**
It should run both commands