Replace missing svg links in calendar CSS

Note - this only works for Drupal 10 and is not backwards compatible... so a more complete solution will likely be needed. Options include:

• copying the SVG files to the module - the easiest
• loading a different CSS file for d10 using Deprecation helper

I would suggest the former since it is just 4 SVG files, but I leave it to the maintainers to decide. For now, this will allow D10 users to patch the CSS.

I just realized that I missed the Kanban css as well.

Attached is the patch I'm using locally in my repo, and it seems to work well.

Please note that as I mentioned above, this works for D10, but it "breaks" for D9. So, accepting this directly in is fine, but we should be aware of it.

I agree that copying these icons to the repo is probably the best option. Thanks for reporting @rlnorthcutt!

Automatically closed - issue fixed for 2 weeks with no activity.