Werk #10882: Fix "Customers" dashlet shown on customer sites

The customer sites only have information for a single customer. It does not make sense to show the customers snapin in the main dashboard. You can view the numbers and open the related objects using the Tactical overview snapin.

The customer snapin is now removed automatically from the builtin main dashboard. In case you have built a custom dashboard, it will not be affected by this change.

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