Privilege check added to update function and message

Based on bug report, menuSales.cpp was reviewed and detected that menu privilege check is OR linked with CustomerMasterMaintain so CustomerMasterMaintain activates the menu option. The behavior requested by the bug will make the utility to work only having the update credit status privilege. As bug is confirmed I have programmed the privilege and a error message if the user don't have it.
@malfredo32 

Please back out the changes to guiclient/updateCreditStatusByCustomer.cpp and push this to your haxtuple1 branch on github? I'm going to mark 23832 as not-a-bug for now.

If you can do this today, I'll merge this branch with the fix for just 24512 in time for the 4.7.0 release.

Sorry for the confusion and delay.
Gil