Before this commit, the media dialog was not handling properly the upload of svg files from the media library: a whole part of the original ImageWidget was missing in the converted media dialog from [1], which was converting the svg with the appropriate color codes from the color palette, to allow for color customization. See original file from 15.4: web_editor/static/src/js/widgets/media.js. Also, it was not displaying those svg correctly with the appropriate background. This commit fixes those issues by adding back the code handling the dynamic colors detection and the background css rule. [1]: https://github.com/odoo/odoo/commit/31cc10b91dc7762e23b4bde9b945be0c4ce3fe3b task-2687506 Part-of: odoo/odoo#95955