Changing the focus stack when destroying a container's node on a
non-visible workspace (on an non-focused output) incorrectly causes
the non-visible workspace to become visible. If the workspace is empty,
it will not be destroyed since it is now visible. Additionally since
there was no workspace::focus event, swaybar still shows the previous
workspace as focus-inactive. It also makes no sense to change visible
workspaces due to a container on a non-visible workspace being
destroyed.
Since the focus will either be set when switching to the non-visible
workspace or the workspace will be destroyed due to being empty, there
is no need to change the focus stack when destroying a container on a
non-visible workspace.
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