Copy default filename string when assigning to default preferences

This tries to remove subtle ownership issues. When copying preferences
structures, the default filename is copied. But the default preferences
struct simply takes a pointer to a global string which is free()d in main().

Now, this is not strictly a bug because the free()ing of preferences
resources is not implemented. Yet, let's try to make this consistent.

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

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