FIX: Use CDN path when redirecting SVG sprite path. (PR #13575)

This ensures that CDN URLs with relative paths do not end up losing the relative paths.

GitHub

It looks like it has been path for a while; how come it has only recently broken?

Was it because theme_id was converted to 0 if it was nil?

Awesome :heart_eyes:! Thanks for the speedy fix.

Good question… I think my change in PERF: Eager load Theme associations in Stylesheet Manager. · discourse/discourse@8e3691d · GitHub changed something here. Let me investigate alittle more.