Non-admin cannot view Dashboard

In a recent update, a capability check was added to the beginning of \FDSUS\Controller\Admin\Settings::maybeProcessSave(): https://plugins.trac.ww.wp.xz.cn/browser/sign-up-sheets/tags/2.2.2/controller/admin/settings.php?marks=678-681#L671

The problem is that this check runs on every call to admin_init, regardless of whether there’s an attempted save routine taking place or not. As a result, non-admins are never able to visit any page in the Dashboard.

The highlighted block should come *after* the check for 'submit_hidden', not before.