cleanup: free print dialog in planner

When printing the plan, a print-dialog was created with "new",
but not freed later. Strictly speaking, this is not a leak,
because the dialog is attached to the main-window in Qt's
object hierarchy. Thus it is freed on application exit. On
the other hand, it is a leak in the sense that resources are
pointlessly hogged until application exit.

Let's just turn it into a stack-allocated object.

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

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