PdfView load event never fired

### Problem description
The pdf content is displayed without problem, but the load event is never fired.
->

### Expected behavior

load event works as expected

### Environment

- Tabris.js version: 3.9.0
- Device: Huawei P10 lite, Xiaomi redmi 10 Pro
- OS: Android 8 and 12, Ios 16

### Code snippet
```javascript
import{contentView, PdfView, fs} from "tabris";

fs.openFile({

type: "application/pdf",
quantity: "single"

}).then((result)=>{

if(result.length > 0){

new PdfView({

top: 0,
left: 0,
right: 0,
bottom: 0,
zoomEnabled: true,
pageElevation: 2,
background: "#ffffff",
spacing: 12,
src: result[0]

}).onLoad((event)=>{

console.log(event)

}).appendTo(contentView)

}

});
```