Revert "Do not reset disabled items if there was no previous stagemode"

This reverts commit d5159d4164916ce0ea802ad2829dd9907923c536.
Revert "Re-enabling all disabled items (steps, proposals) if stagemode has changed"

This reverts commit 3e6c899896d1fd2984c010dfc5f51c7d5490602e.
Revert "Re-enabling all disabled items (steps, proposals) if stagemode has changed"

This reverts commit 6843f1eecb8a98090b06942cc86c9a78e1e1ffe2.