Fix VITE_SUPPORT_URL contact link

[davinotdavid]

Description of the Change

In Accounts, after we moved the contact support form from the Django route rendering a Vue form only -> the route in the Vue SPA, the URL actually changed from /contact/ to /contact.

The trailing / causes Accounts to resolve the URL through the Django router (and prompts a login) instead of the being caught by the Vue SPA and handled by its Vue Router.

Benefits

Contact support link won't prompt a re-login

How to test

0. Ensure that you have the following .env vars in your frontend/.env file:

VITE_AUTH_SCHEME=oidc
VITE_SUPPORT_URL=https://accounts.tb.pro/contact

1. On an incognito window / without being logged in, navigate to localhost:8080
2. On Keycloak's login page, click the Contact support link
3. See that you are redirected to https://accounts.tb.pro/contact without being prompted to login

Applicable Issues

Fixes #1384

[devmount]

Good catch, thanks!