JpegBitmapEncoder default QualityLevel issue

### Description

If to set QualityLevel of JpegBitmapEncoder to 75, the quality level of a generated image will be 90, not 75.

This happens because SetupFrame method checks if the value of the level is a default one (that is 75) and doesn't set ImageQuality property of the native encoder.

But, according to https://learn.microsoft.com/en-us/windows/win32/wic/jpeg-format-overview the default value of the quality in the native encoder is not 0.75, but 0.9.

### Reproduction Steps

Execute the following code:

```
using var imageStreamSource = new FileStream("input.png", FileMode.Open, FileAccess.Read, FileShare.Read);

var decoder = BitmapDecoder.Create(imageStreamSource, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);

var frame = decoder.Frames[0];

var encoder = new JpegBitmapEncoder()
{
QualityLevel = 75,
};

encoder.Frames.Add(decoder.Frames[0]);

using var fileStream = new FileStream("output.jpg", FileMode.Create);
encoder.Save(fileStream);
```

### Expected behavior

Saved JPEG image has Quality Level 75

### Actual behavior

Saved JPEG image has Quality Level 90

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

_No response_

### Other information

_No response_

Start by locating the JpegBitmapEncoder SetupFrame method and inspect how QualityLevel is passed to the native encoder, then run the supplied PNG-to-JPEG reproduction. Done means setting QualityLevel to 75 produces a saved JPEG with quality level 75 rather than 90.

Written by the indexing model from the issue text.