Revert "Fix .hidden class specificity, should not be overridable, ref #12138"
Revert "Fix .hidden class specificity, should not be overridable, ref #12138"

This reverts commit 25e70e1eb798d9292b4d5864d89c6c424ff0218c.

nextcloud/server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server