Enhancement: Declined shares are now easily accessible

We've redesigned the 'Shared with me' page,
so the 'Declined shares' section is now displayed under the 'Accepted shares' section.
There is no need to click the toggle button anymore which makes the 'Declined shares' easily accessible.

https://github.com/owncloud/web/pull/7356
https://github.com/owncloud/web/issues/7342


