LoginSetupActivity: allow http/https in intent filter (#211)

* LoginSetupActivity: allow http/https in intent filter

Initially introduced in https://github.com/bitfireAT/davx5-ose/commit/054f1ece612eceef962b356b7ad8b2b7125a6393

,
this `intent-filter` breaks login from the Nextcloud app, as we send the server URI as `http`/`https`.

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

* Update intent-filter for login flow on api lvl 33 (closes bitfireAT/davx5#172)

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>
Co-authored-by: Sunik Kupfer <kupfer@bitfire.at>