chore(deprecations): use @nextcloud/router for generateUrl

[max-nextcloud]

• Target version: main

Summary

fix some deprecations

Checklist

• [x] Code is properly formatted
• [x] Sign-off message is added to all commits
• Documentation is not required

[juliushaertl]

Thanks, will give it a quick spin later because I remembered some difference in handling trailing slashes in the library at some point when switching