Can not process upload of 2 files with @tsed/platform-multer
### Describe the bug

The code below works fine with @tsed/* version of 8.6.0 but has problems after migration to version 8.7.0 and @tsed/platform-multer

### To Reproduce

1. create a controller like this 

```TypeScript
import {Controller} from '@tsed/di';
import {MultipartFile, type PlatformMulterFile} from '@tsed/platform-multer';
import {Description, Post, Returns} from '@tsed/schema';

@Controller('/api/1.0')
export class MyController {

    @Returns(201)
    @Post('/test')
    @Description('Upload files')
    public async uploadFiles(@MultipartFile('file1') file1: PlatformMulterFile, @MultipartFile('file2') file2: PlatformMulterFile): Promise<void> {
    // some logic here
    }

}
```

2. try to call this API from Postman or unit test
3. The error will thrown:
```TypeScript
Error: Unexpected end of form
    at Multipart._final (/Users/Work/Projects/test/node_modules/busboy/lib/types/multipart.js:588:17)
    at prefinish (node:internal/streams/writable:916:14)
    at finishMaybe (node:internal/streams/writable:930:5)
    at Multipart.Writable.end (node:internal/streams/writable:845:5)
    at onend (node:internal/streams/readable:948:10)
    at processTicksAndRejections (node:internal/process/task_queues:85:11) {
  storageErrors: []
}
```

### Expected behavior

The server should process 2 files without any error

### OS

MacOS

### Node version

Node 22.14.0

### Library version

8.7.0

### Additional context

If the code above will be changed to 

```TypeScript 
public async uploadFiles(@MultipartFile('files') files: PlatformMulterFile[]): Promise<void> {
    // some logic here
}
```

Everything will work fine. But this is not acceptable for my API.