Project filter during group change

Task #10093

The error was ultimately a query incorrectly translated into C#, which crept in during the .NET migration. This meant that the group that was created last (in SwissSalary) was retrieved for the dimension filter instead of the last assigned employee group, regardless of when it was assigned to the employee. The wrong group triggered the wrong dimension filter, which then filtered out the wrong dimensions (or didn’t show the right ones). The trouble has been eliminated.