use sRGB colorspace instead of RGB in image conversion.
> Note, ImageMagick assumes the sRGB colorspace if the image format does not indicate otherwise. http://www.imagemagick.org/script/command-line-options.php#colorspace Also updated expected converted result with sRGB output.
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![product/ERP5/tests/test_data/user-TESTSVG-CASE-EMBEDDEDDATA.png](https://lab.nexedi.cn/romain/erp5/-/raw/b022e37093d9ead282d04b5a8cf172974947e725/product/ERP5/tests/test_data/user-TESTSVG-CASE-EMBEDDEDDATA.png)