Sprite picking with DDS texture triggers unsupported format warning and BoundingBox mode has no effect

## Bevy version and features

- The release number: 0.19.1.
- Enable features: "dds".

## What you did

The bugs is that when you add a pickable sprite with texture `dds`, and then touch the sprite, it will give a warning:
```
Failed to get pixel color for sprite picking on entity 12835v2: unsupported texture format Bc3RgbaUnormSrgb. This is often caused by the use of a compressed texture format. Consider using `SpritePickingMode::BoundingBox`.
```
And if you add resource `SpritePickingMode::BoundingBox` by setting `SpritePickingSettings`, it doesn't give a warning, but also has no effect.

Reproduce the issue with Bevy 0.19.1, the dds feature, a pickable sprite using a DDS texture, and SpritePickingSettings set to SpritePickingMode::BoundingBox. Search for SpritePickingMode, SpritePickingSettings, and the “unsupported texture format” warning to trace both paths. Done means BoundingBox mode avoids pixel-color lookup and the warning no longer appears for compressed textures.

Written by the indexing model from the issue text.