planner: pass in_planner down to TemplateLayout

The TemplateLayout prints different dives depending on
whether the planner is active. Instead of accessing a
global variable, pass the status down from the MainWindow.
That's all quite convoluted, since there are multiple
layers involved.

On the positive side, the in_planner() function has now
no users an can be removed.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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