Regression with v8.17: PNG to JPEG conversion with DisplayP3 profile

While updating from libvips v8.16 to v8.17 one of our tests found a regression for a PNG (DisplayP3) to JPEG conversion.

**To Reproduce**
```
vips copy display_p3.png 817.jpeg
``` 
[display_p3.png](https://github.com/user-attachments/assets/76fc107f-593a-44f3-ac43-18756d184581)

**v8.16.1:**
<img src="https://github.com/user-attachments/assets/dab15e03-7c42-4273-84cb-95347ffebf0a" width="200"  />

**v8.17:**
<img src="https://github.com/user-attachments/assets/1addae27-4be6-4651-9da2-a107fe6bad80" width="200"  />

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Regression with v8.17: PNG to JPEG conversion with DisplayP3 profile #4568

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Regression with v8.17: PNG to JPEG conversion with DisplayP3 profile #4568

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