Hide leave team button if team is created through OIDC.
Co-authored-by: Daniel Herrmann <daniel.herrmann1@gmail.com>
Reviewed-on: https://kolaente.dev/vikunja/vikunja/pulls/2181
Co-authored-by: waza-ari <daniel.herrmann@makerspace-darmstadt.de>
Co-committed-by: waza-ari <daniel.herrmann@makerspace-darmstadt.de>