Werk #346: Fix folder visibility in WATO for unpriviledged users

In WATO if you are an unpriviledged user you might have write access to some lower subfolders but not to the upper folders. This is perfectly common, because that way the monitoring administrator can delegate tasks for certain classes of hosts to his collegues.

Previously, however, you couldn't navigate to the lower folders without faking the URL. This has been fixed now. If you are located in a folder without having permissions to it you won't see any hosts of that folder, but still you see the subfolders and also can enter these.

Also this fix removes that buttons for actions on a folder if you do not have write permissions to it.

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