Host name with trailing slash leads to 'Page not found' for log-in

Describe the bug

When adding a trailing slash to the Host name, the log-in page on the server won't be found. A "Page not found!" will be thrown instead.

How to reproduce

1. With fresh install, or after signing out, add a Host name with a trailing slash
2. Tap on Log in
3. See error

Expected behavior

Display the log-in page of the Funkwhale instance.

Screenshots

Environment details

• Device: Fairphone 3
• Android version: 10
• App version: 0.1.1
• If public Funkwhale instance, its URL: n/a

Logs

n/a