Inaccessible route to list urls in group

https://github.com/coding-blocks/shortlr2-backend/blob/95ad698ded5e1c6c90675bd7956129c5ce7468da/src/routes/api/url.ts#L13-L37

Since both of the routes mentioned above look on the root i.e. (`/api/url/:slug`) the route to list the group is never executed, as the first route returns a 404.

This must be fixed as it makes listing URLs of a group impossible.

---
**Bounty Claim** : Triage needed.
Not sure when new claim option would close, therefore submitting with 0 bounty as not assigned.