Werk #14720: Fix "Percentage of service problems" dashlet in custom dashboards

Depending on the current configuration, the dashlet Percentage of service problems reported "Sorry, you cannot create combined graphs for more than 100 objects" when used in custom dashboards. This regression was introduced with werk #14423.

Note that this werk only affects custom dashboards, not builtin dashboards such as the main dashboard. It is possible that werk #14423 results in the error message also being displayed in the main dashboard, on which this werk has no impact. Note that this probably means that the Percentage of total service problems graph in the main dashboard was showing wrong values prior to werk #14423.

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